Stone and Webb investigate after an incident occurs between Trevor Berwick and Dr Josh Thomas. It is thought by Trevor that Josh has been having an affair with his wife Penny. After Trevor is released he goes missing with his baby and Stone realises that he has over stepped the mark whilst questioning him.

Janine Clark tells the police that has been raped by her boyfriend Mark Watts and three of his friends and the team have to try and discover if what she is saying is the truth.

DC Jo Masters need to find proof after she thinks that man who broke in a couple's flat is a stalker. Jeremy claims that he and the woman called Ami are having an affair. Ami claims that she has never met Jeremy and Jo finds out they work at the same place and that Jeremy is a security guard. Jo thinks that Jeremy could of been using his position to spy on the woman. Jo receives some surprising news from Superintendent Meadows.

Jo and Leon are sent to deal with an aggravated burglary which has left John Baker who owns the house dead. Max and Grace find out that John's wife Tanisha has been missing for around 20 years. They soon discover learn that John had been having an affair and that his wife was scared of him at the time she disappeared. After both Tanisha and Baker's son Ian confess to killing John, Grace tries to find out what really happened.

After a letter bomb is delivered to an office, the manager thinks it to be a hoax. Grace thinks though that it could be the beginning of something a lot more sinister though. Callum finds out that the manager's brother is involved when then the equipment to make the bomb is found at his house.

Stone and Taylor find themselves involved in an armed siege when Alan Wilcock calls stating that his unbalanced ex-wife Carly has locked herself in his house with their young son. After a shot is fired inside, CO19 are called in to help deal the situation. Jo Masters is able to establish a rapport with Carly through an Internet link. Carly becomes more upset at the tension begins to grow.

Clarinda Blake and Tim Hardacre are seen arguing in an alley by Callum on his way home after a night out. Callum ends up being beaten up when he tries to defend the girl. When she is questioned Clarinda insists she was the victim of a mugging. It is soon revealed that Clarinda's son Andy had been dealing drugs for Tim and when she found out, she confronted the man. When Tim ends up being released Callum decides to track him.

Stone and Masters have to deal with an incident outside a nightclub. Stone ends up using more force than is necessary to stop a passer-by from interfering and somebody records it on their mobile phone and posted the video online. Commander Lisa Kennedy and Supt Jack Meadows are worried about the media fallout and initiate an inquiry into what happened when the person in the video decides to press charges. DS Stevie Moss and DC Jacob Banks talk to the club's owner about the fight and discover that the man is hiding something as they try and clear their friend's name.

Roberts and Gayle are caught up in a shooting and Inspector Smith and Sergeant Masters have to investigate what happened.

Jo and the team have to deal with a road traffic accident where a motorist has hit a youth who has since run off. A teenage boy is discovered lying fatally injured in a nearby park by a cyclist. The team have to work out if the incidents are related.

The hunt for them who murdered Paul Sorrell continues after Devon Marshall and Jedda Atkins are released due to lack of evidence. Max believes that teenager Jasmine Harris has information she is hiding. Mickey doesn't want her involved but Neil over rules him. Devon makes a deal after his house is burgled and his car set on fire and tells the police who really fired the bullet.

After four-year-old Billy Sullivan goes missing from his father's garden an investigation is launched. CCTV footage shows the boy getting into a car with a false number plate. They soon discover that the false plates where sold to Peter Grigson. When the police catch up with Grigson, Billy is not with him. Grigson ends up admitting taking the boy but claims he called the police and said he dropped him off at a local market.

After a body is discovered following a crowd-control situation at a football match, a murder investigation is launched. Jack Meadows decides to take his team to the ground to keep control when tension continues to grow between rival fans. Lisa Kennedy is worried as her son is attending the game and could end up being caught up in the trouble.

Following the death of Yusef Hanoush at the football riot, the team find themselves under pressure from the media. CCTV evidence shows Commander Kennedy's son Mark at the scene of the murder. Mark is brought into the station for questioning. The team try to find out more about Yusef's life and soon learn that he was having an affair with his boss. Two more suspects are arrested and questioned.

Jimmy Ferrier, a known drug dealer approaches Mickey following the death of his brother. Max and Mickey become suspicious about Ryan Lacey after attending the funeral. When the team get Jimmy to set up a meeting, Mickey is shocked to discover Max snorting cocaine and thinks Ryan could know more than he is saying.

Jo and Benjamin are called out to a local hotel where a man named Mark Pierce is demanding to be let when he claims his wife Julia is staying there. Alan Marsh is found badly injured in her room whilst Julia has disappeared. Forensic reports show that she is not the culprit but how is she connected to the real attacker, Craig Chapman. Mark is able to identify Craig as Julia's brother who was supposed to have died in a car accident about 15 years ago.

Paul Rayner is arrested for assaulting a man called John Morris. Paul insists that he was abused as a boy by Morris but it becomes apparent that it is a case of mistaken identity. When the police manage to find the man who Paul claims did abuse him they are unable to arrest him without more evidence. Paul tells them that the man abused somebody else as well but the other victim refuses to testify against him.

After a 15-year-old girl who has been missing for the pat two years is found confused and traumatised, the team attempt to identify her and discover why she is there. Helen ends up revealing that she was forced into prostitution by her boyfriend Hassan's uncle. When they discover him kissing another girl, the team realise they will need Helen's help to stop another girl ending up like her.

After the body of a missing boy called Matty Wallace is found in local woodland the police investigate. Jane , his mother, claims that she didn't realise he was missing until she went to his school. His stepfather says he has been working away for several days and knew nothing of the boy's disappearance. Following further investigation and the results of the postmortem, the team begin to think that Jane may hold the key to her son's death.

Matty Wallace's funeral is attended by Neil and Grace with the boy's stepfather Craig Gant. Max finds out that Gant has a criminal record for handling stolen goods but believes there is more to the story. A surveillance operation is planned when the team find out about a possible lorry hijacking.