After having been seen arguing with her boyfriend in an alleyway a young woman is found badly beaten up. When the team look into the case they find her personal life very complex and it complicates the investigation.

After a night out a couple return home to find their daughter missing and the story offered by the nanny ends up being unreliable.

The baby girl's body is found and the nanny's boyfriend look like the guilty party. After being questioned though Sam and Jacob find themselves with a new suspect.

After a teenager is found dead following house party the main suspects are soon revealed to be a couple of his class mates.

Heaton hold a press conference as he attempts to get a confession out of the prime suspects in the case. When the truth is finally revealed Heaton is shocked.

A body of a murdered woman is found in a park. It is soon discovered that the body belongs to a woman who has been missing since 1988 and her family are informed. Heaton seems the similarities in the crime to a murder case he worked on 20 years ago.

With CID hitting a brick wall in the investigation to the death of Susan Clark, Heaton interviews jailed murderer Ian Ellis. When another missing person is revealed, Heaton arrests him for Clark's murder. When the third body is found, Ellis goes on hunger strike and dismisses his solicitor, leading Heaton to come under fire.

Ian Ellis is rushed to hospital following a suicide attempt in his cell, and things only go worse for Heaton when Banksy discovers Ellis was in custody when the third victim went missing, leading Ellis' family to call for Heaton’s job. He promises Ellis a quick release as he recovers in hospital, but Heaton offers to speed up the process if he gives information on two contractors that could be responsible. One is cleared, but the other is hunted down. After a chase, a woman is found unconscious but alive in his van, and Heaton considers using this to open up the suspect's wife.

Smithy finds a taxi driver beaten up and his takings missing. An Oyster Card belonging to Ellie Gladstone is found nearby and she is questioned about the attack. As the case develops another suspect is uncovered.

Nate and Ben investigate a break in at the home of Jill Bentley and learn that that her teenage daughter, Sarah, was home alone. Ben discovers that Sarah was holding a party at the time. After her boyfriend is found beaten up, Sarah admits there was a party and that Aubrey Haynes persuaded her to take drugs and then tried to attack her.

Maria Joseph visits Nate at work to return the handcuffs he left at her house after they spent the night together. He is not happy though when he finds out that she tends to Aisha Katri's wounds at the hospital and did not get her to report being attacked to the police. As they argue Maria informs Nate that Aisha and her family are illegal immigrants.

PCs Millie Brown and Mel Ryder come across a group of Polish teens hassling a burger seller whilst out on patrol. Pawel is arrested and DS Max Carter interrogates him and finds out he is the nephew of Marek, who runs a local extortion racket. When Carter discovers his latest operation he sets up a sting to bring him down and he asks Pawel's stepmother Julie, to help with it.

CID's raid goes pear shaped after the disappearance of Marek Jankowski, and the shooting of informant Cezar Sobiesneki. Cezar's niece, Marek's sister in law Julie, accompanies him to hospital where he dies. Julie blames Carter for Cezar's death, and things get worse when Carter lets slip he killed her husband. When Marek attempts to abduct Julie's son Lukas, Carter convinces her to help him find her other son Pavel, prime suspect for Cezar's shooting, before CO19 do.

As Carter, Dasari and Banks are trying to catch a drug dealer his accomplice injures a young woman as he tries to escape. The team are determined to find out his identity.

Sally and Ben investigate a theft at a local social club. Magician Drake Danvers' gambling problems make him a prime suspect. When his girfriend is attacked, Drake admits that he is being blackmailed by somebody.

Some drugs are found at a local boxing club following an attempted suicide. The police have a hard time getting the truth out of anyone at the club. Beth and Terry finally come to some some of understanding. Beth finally receives the letter from Witness Protection she has been waiting for but it would mean leaving Sun Hill for good.

Beth and Nate discover a woman lying unconscious at the bottom of her stairs after they are called out to a domestic incident. It is revealed she is married to the owner of the boxing club, Charlie. Charlie insists that his wife just fell. Later their daughter is arrested for stealing money from her father's shop. Beth kisses Nate goodbye.

Art Minshull is found unconscious injured in a layby. Smithy thinks the lorry he was driving has been hijacked for the cigarettes it was carrying. CTV footage shows Art and woman and a child getting into the back of the lorry though. Art will not tell the police the identity of the people who seem to have been smuggled into the country but does admit he was attacked.

After Callum and Leon investigate a burglary they are called to say the missing goods have been returned. Connor Deegan admits his guilt and when his flat is searched by the police his sister is discovered beaten up there. It is she revealed that she is the the real thief and commited the crime to help pay for her drug habit. Connor agrees to help the police catch local drug dealer Darren Bailey.

Sally and Millie attend a domestic disturbance at a house. Larry is throwing his girlfriend out who is a former drug addict as he believes she is using drugs again. When Larry's daughter later disappears he believes that his ex girlfriend is involved.

Sgt Stone, called to the scene of a reported theft, realises that the suspect is the victim of domestic violence. She alerts Stone to a meeting between her husband and his criminal associates, so TDC Fletcher and DS Carter mount a surveillance operation.

Nate Roberts is assigned as the Safer Schools Officer at Deansgate School after investigating a case of arson there. When he and Smithy investigate a fight in a local park, Smithy ends up being stabbed. Nate is determined to catch the guilty culprit as Smithy recovers in hospital.

Nate has to investigate drugs being taken at Deansgate School after a pupil is taken to hospital after taking ecstasy. Everything is not as it seems though as he investigates the case.

When Rhys Tanner's home is broken into Nate investigates. Nate discovers that two school pupils could be involved and investigates further.

Nate has to break up a fight between two parents at the school. Nate later finds out that one of them has become slandered in a rape case. After he is beaten up CID investigate and are shocked to discover the identity of the real culprit.

Nate and Mel investigate a burglary in a class at the school which leads on to a whole another case.

School pupil Kim Patterson gives Nate some surprising information. Nate discovers that her father was involved in the theft of Becky's computer. Becky tells Nate the reasons why she split up with Kim's father but is everything as straight forward as it seems.

Former Sun Hill PC Diane Noble, now a Sergeant, joins Sun Hill for a night before joining her new post at Barton Street. She and Smithy lead the troops to a rooftop party at a building site, but events take a sinister twist when a boy falls from a ledge whilst high on ecstasy. Tests at hospital reveal they were mis-labelled as ketamine. Backed by Turner and Fletcher, uniform go undercover at a club to snare the dealer, with Taylor keen to impress Noble after getting off on the wrong foot. As Noble prepares to bow out of Sun Hill for one last time, she is called back to St. Hugh's when the overdose victim's father stands on the roof in a bid to commit suicide.

Leon and Roger find Tommy Mackenzie and his wounded father when thay attend a call out.A friend of Tommy's mother fits the description that has been given but their ends up being more to the case than first seems.

Gayle, Armstrong and Smith attend an armed robbery at a toy shop, with the manager shot during the raid, but a pursuit fails to prevent an escape. Carter takes charge of the investigation, and CCTV footage appears to show two known thieves casing the shop the day before. Carter suspects that a woman seen arguing with an employee moments before the robbery was acting as a decoy, but while Brown is convinced of her innocence, the rogue DS is only interested in undermining her opinion.

Brown and the sister of a suspect in an armed robbery investigation are taken captive by armed drug addicts. Carter, convinced he knows who is behind both the robbery and the kidnapping, mounts an observation with Armstrong and Gayle, but their operation is compromised when the kidnap victim's ex-husband arrives at the scene to confront their prime suspect. When Carter discovers his prime suspect is not responsible, he enlists his help to identify two of his employees, the men suspected of the abduction. Fletcher is intrigued to discover the toy shop manager was victim of another armed robbery a few years earlier; is he foolish enough to try it again or is it pure coincidence?

Sun Hill officers investigate an armed robbery at a jewellers and are shocked to discover the true identity of the criminal.

Grace becomes concerned when Stevie completely loses her temper with Barry when questioning him.

Schoolgirl Lily Walmsley goes missing and CCTV footage shows her getting into a car with a man. Rebecca her friend tells the police that she has not been happy recently and that Lily had bruises on her body. The car she is seen getting into ends up just being a mini cab driver. Lily calls her mother in serious trouble and the team try to find her before it is too late.

A restaurant is put under surveillance as it hardly has any customers but its owner Maloud Senac has been putting large deposits into his bank account. An informant tells Stevie that Senac is going to import thirty kilos of cocaine into Britain. When a sting is set up, things don't go to plan. Senac's daughter Salma is kidnapped and when Samantha finds out she wonders why he not told the police.

When Daniel Pfeiffer is questioned he ends up admitting that he and Salma Senac are in a relationship. He insists that is was his brother Gary who was involved in the drug deal with Senac. After Kenny regains consciousness he informs Terry that it was Gary who shot him but it was Daniel who goaded him into doing it. Samantha announces that she has resigned and that today is her last day.

Petal Ford is knocked out just outside a known drugs den. When Leon attends the crime scene a man trying to help her runs off. After Mickey questions her he is not convinced she is telling the truth. The man who was helping her is identified as Ben Meadows, Jack's son, who has just been released from jail. Ben does not want Mickey telling his father after he admits that he is Petal's boyfriend.

Jack thinks that his son has lied to him following the failed drugs bust. After talking to Sennett in hospital though he finds out that Ben actually tried to help the police. Petal calls the police when Linton Barry tries to break her door down. When Jack shows up he finds out that his son is OK but Petal has been taken hostage.

After Smithy tries to break up a fight outside a bar he discovers Andy Brennan has badly beaten up. Sergeant Stone investigates a break in at Oliver Robinson's home where a valuable watch has been stolen. The missing watch is found on Andy who turns out to be Oliver's brother. Everyone seems to be scared of bar owner Jason Devlin.

The team discover just how many enemies Jason had following the fire at the bar. It is revealed that Jason and his father are slum landlords, forgers and drug dealers and that Jason's girlfriend has been seeing somebody else. Jason's father gives his son an alibi after Ali is beaten up. Smithy is determined to see them locked up.

Smithy and Ben come across a lorry shipping Afghan immigrants whilst they are out on patrol. DC Stevie Smith finds out that the translator at the station asked a young girl to lie whilst she is being questioned. Stevie finds out that Jason Devlin is involved in what is going on. There is trouble on the Westgate Estate when a riot breaks out.

Stevie and Jason are in hospital following the riot. Smithy feels bad about attacking Jason and Stone advises him to say nothing about what he has done. Khaled who is going out with Ara is questioned and he admits he is involved in the human trafficking. He informs them that Jason's father is the mastermind behind the operation and the team realise they will have a difficult time finding proo

Callum and Smithy end up in a fight when they attend a training session. Allegations are made against Smithy by Jason Devlin who claims he set him up. Rachel learns from Heaton that he is leaving to set up a specialist unit targeting human trafficking and he asks her to join him on the new team.

Ara Byat calls to say that her niece has disappeared on the morning of the court case. It looks like the Devlin family have kidnapped her to stop Khaled Hasiq from testifying. Smithy takes the stand and has to decide whether to be honest with his answers. Stuart and Kezia decide to leave Sun Hill and join Heaton at the specialist trafficking unit. Jack becomes the station's new superintendent and Smithy is promoted to inspector.

Danny Sissoulu ia discovered by Callum and Ben badly beaten unconscious and his brother Kip and friend Mo covered in blood. When Callum confronts Ollie Readshaw who is acting suspiciously he runs into the road and is struck and killed by a lorry. Neil talks to Ollie's mother and he thinks she is hiding something.

When Danny Sissoulu dies the team now have to deal with a murder enquiry. After Craig Middleton becomes the number one suspect he is brought in for questioning. He insists that he was confronted by the three youths in the park and that they where carrying a knife and continues that he only punched Danny. The officers are stunned by what Mo tells them after she cracks under the pressure.

Macey, Mickey and Banksy question a girl about an alleged rape and find out that the attack actually took place two years. The team watch a video tape and her step father is disgusted when he finds out that he is accused of the crime. Caitlin later calls Mickey and tells him that she remembers who really attacked her with devastating consequences for two families.

Joel Fuller is arrested after attacking a man in a pub. After his wife is questioned she admits that Joel has just found out that she is having an affair with her boss, Dave. When Joel makes his way to Dave's house armed with a gun CO19 troops are brought in to help deal with the situation.

After a child is found abandoned in a market, all he will say is that somebody called Clara is dead. After his mother is traced it turns out that Clara is his nanny. Clara is discovers at a local construction site beaten and unconscious. Jared Miles becomes the number one suspect after he was seen running through the market. Neil is worried though that they could be after the wrong man.

Neil be lives that somebody has a vendetta against Julia Bickham. After Jared Miles innocence is proved, he identifies a man he saw with Thomas Sands called Stephen Fairfax. Neil learns that Julia gave evidence at an inquest about a suicide which meant that Fairfax lost an insurance claim and the custody of his child. After Fairfax kidnaps Julia, Neil manages to locate them at deserted warehouse where he comes face to face with an armed Fairfax.

An emergency call is made informing the police that a newsagent called O'Halloran has been murdered. Banksy discovers that the call came from Joseph Sissoulu's mobile. Finger prints at the scene are revealed to belong to Mo Campbell, who is a friend of the dead man's son. Mo admits to killing the man but is he telling the truth.

Neil and Max investigate after Ashley Simmons is found shot dead. After her mother's boyfriend's car was seen near the scene of the crime he becomes the prime suspect. The forensics team prove though that she was killed at her mother's house.

Paul Brewer is questioned by Carter and Masters after indecent images of a young girl are found on his computer following a raid. Paul names paedophile George Fielding as being responsible as he lent him his computer. Banks is suspicious after Fielding agrees with Paul's version of events.

When Jo and Max raid the house of Jimmy Mack they fail to find his drugs consignment or his girlfriend, Rochelle who has gone missing. Sally and Roger go to the house of former prostitute Fran Morris, where her young son Noah has passed out. Rochelle is discovered in Fran's flat, tied up and badly beaten. Rochelle is too scared to the police what has happened. Fran names Jimmy's solicitor Damian Tucker as the man the police are after when she sees him at the police station.

Fran Morris is assaulted and her 12-year-old Noah goes missing. The primary focus is to first find Noah when his t-shirt is found with blood on it. When he is found, he bonds well with Carter, and a groundbreaking lead is uncovered. Carter tries to get a drug dealer to sell out Damian Tucker despite the fact that he is in jail. A bombshell discovery by forensics leads Carter to discover the case is not as clear cut as it seems.

Mel meets a youth called David Jarvis who claims he has been imprisoned and abused five years by a man called Gareth. David's sister is unable to verify who he says he is. When Gareth is arrested he claims he has been paying David to have sex with him. David's story starts to fall apart and the police try yo find out what happened to the real David.

After an 8 year old boy is reported as missing, his mother tells the police that she and her husband are going through a bad divorce. Phil isn't happy when he is questioned like he is a suspect in his son's disappearance. CCTV footage shows the boy getting into a car with a man named Nick McCann. The team discover that the boy has spoken to his mother's new partner, Danny on Nick's phone. Terry and Stevie try to get the truth out of Danny before it is too late.

The police discover that Mark Wilson is making Ria, who is dating his brother, bring a phone into prison for him. The police want to bug the phone. Ria is attacked at the prison by her boyfriend, Shaun. On the bug the police learn that Shaun has ordered a hit on Ria.

Leon and Nate are asked for help from Lily Wright after her car is stolen with her baby daughter Chelsea inside. Inspector Smith has to break the news to Lily and to Chelsea's father Gavin after the car is found empty. The chief suspect is found badly beaten up with no sign of the missing baby anywhere. After Leon and Nate manage to find the missing child covered in bruises the chief suspect insists that he had nothing to do with what happened to her.

Smithy leads a raid on a housing estate which has a lot criminal activity. The main objective of the raid is to get drugs dealer Dave Clayton but when he is caught he has no drugs on him. Only local resident Angie is prepared to stand up and talk about about what is going on and later her daughter is stabbed on the estate. Tony considers moving on from Sun Hill.

A shocked Leon finds Lily's 18-month-old baby Chelsea unconscious after he responds to a call. Leon thinks that Lily is lying when she says the baby fell out of her high chair and thinks her partner could be responsible. Gavin ends up having an alibi and it looks like Lily could be responsible when tests prove the injuries to the child where not an accident. Tony remembers his time at Sun Hill as he prepares to leave forever.

Guest starring Ian Kelsey as Brendan Newlyn. DC Grace Dasari re-opens the investigation into an old missing person case when the sister of the woman involved holds a man at knife-point in a Soho brothel, claiming he knows where her sister is. When a body is found, Grace feels guilty that she did not devote more time to the investigation at the time of the woman's disappearance.

Banks and Webb look into the disappearance of teenager Saskia, whose father Eamonn is about to be released from jail. They soon learn that Saskia was seeing the son of man her father killed. The team try to find Saskia before her boyfriend hurts her.

When a tramp is found dead in a local river, Mickey goes undercover as a homeless man.

Mickey is rescued from a beating by Nicola McKenzie, a homeless girl after he spends a night on the streets. Max and Banksy find out more about Greg and discover that he is Greg Simm, a fraudster who has been scaring the homeless. Greg is a suspect after an elderly man is found dead but the evidence begins to point in Nicola's direction. Mickey learns that he has to bring Nicola in for questioning which leaves him conflicted.