This police drama follows the activities in and around Sun Hill, a police station located in the fictional East London borough of Canley. The focus is not just the gritty reality of police work, however; the lives and loves of the officers who staff the precinct get equal play.
Mickey suspects a man he has questioned for assaulting an imagined love rival is dangerously unbalanced, and Callum's macho handling of the man only makes matters worse.
A 16-year-old claims she has been gang raped by her boyfriend and three of his friends, but later asks to drop the charges after receiving threatening telephone calls.
Jo goes on a hunt for evidence after a regular robbery seems far more sinister than it first appears - and her hard work is rewarded with a promotion.
On her first shift as a sergeant, Jo investigates an aggravated robbery where the homeowner was brutally murdered. Grace clashes with Max over an apparent racial prejudice.
A letter bomb addressed to the manager of a successful company proves to be harmless but, after talking to the witnesses, Grace has a hunch that worse is to follow.
A desperate woman barricades herself with her younger son into her estranged husband's house and alerts the police to the fact her children are being neglected.
An off-duty Callum is badly beaten by a man after intervening in an argument, but when his assailant is released due to lack of evidence he takes matters into his own hands.
When Sergeant Stone is called to a fight outside a pub he finds himself being accused of assaulting a member of the public - but was it a punch or just a push?
A witness gives Ben and Nate a lead after their car is hit by a stray bullet, but no evidence can be found to identify the owner of a vehicle seen speeding from the scene.
Part one of two. Jo's team is summoned to the scene of a road traffic accident, but ends up dealing with a teenager found fatally wounded in a nearby park.
Part two of two. Morale within the team picks up as the hunt for Paul Sorrel's killer begins to make progress following revelations from the dead youngster's cousin.
Suspicion falls on the dad of a four-year-old boy who goes missing from his garden, but CCTV footage of the abduction tells a different story. Joel Beckett guest stars.
Part one of two. Jack directs an operation to keep rival football fans apart, but ends up unwittingly channelling a group of them into a dangerous situation.
Part two of two. Preparing to face a hostile media over the football crowd murder, Commander Kennedy is shocked to learn her own son is under suspicion.
A known drug dealer approaches Mickey and asks him to investigate the suspicious death of his brother, an old friend of the detective.
A woman disappears after the man she claims to be her lover is found badly beaten in a hotel room but, even when the assailant is found, nobody's story sounds convincing.
When a man accuses a boxing coach of abuse which happened over 20 years ago, the team has to find another victim in order to pursue the case.
When a teenage girl who was missing for two years is found, the team unravels a grooming operation. DS Max Carter and DC Terry Perkins disagree on how to handle the case.
When a boy's body is discovered in the woods a harrowing tale of family trauma unfolds.
Concluding the two-part story. Max discovers the dead boy's stepfather has criminal connections and, without telling Neil, orders an observation of him at the funeral.
Max is anxious to arrest a man known to be grooming teenage girls online, but Grace urges him to bug the suspect's home and gather watertight evidence to ensure a conviction.
When PCs Gayle and Roberts discover an abandoned car, their investigation soon takes on a new dimension. DI Manson tells team about his son's illness.
Kirsty and Leon discover the body of a Venezuelan woman on a rubbish dump, triggering a desperate race to find the woman's partner and son before further tragedy strikes.
A pregnant woman is injured in what appears to be a carjacking and Leon, still traumatised by the events of the previous day, loses his temper with a suspect.
When PC Kirsty Knight calls on an old woman at home she finds herself swept up in a harrowing rape case. Sgt Stone has to face up to a few realities.
A man found beaten to death turns out to be a widower with a drink problem, two badly neglected children and an unhealthy interest in the landlord's girlfriend.
When a couple fail to turn up at the airport and their dog is brutally killed in what appears to be a burglary at their home, suspicion falls on their son.
Callum answers a call to help Kirsty investigate the case of a woman found unconscious below an open window.
Callum returns to work, determined to uncover the truth about the rape allegation that blackened his dead father's name as a police officer and divided the family for 20 years.
First of a two-part series finale. A teenage gang member dies in Smithy's arms after being stabbed, and one of Mickey's informants reveals vital information.
Last-ever episode. Callum finally proves himself to Smithy as they hunt the members of the Parkway Crew responsible for the death of Liam Martin.