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 intervenes in an argument and is badly beaten. When his assailant is released due to lack of evidence, Callum takes matters into his own hands.
A fight staged outside a club as a smokescreen for a robbery leaves a woman seriously wounded, and Callum is filmed pushing a witness who falls and suffers an epileptic fit.
A witness gives Ben and Nate a lead after their patrol car is hit by a stray bullet, but no evidence can be found to identify the owner of a vehicle seen speeding away.
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.
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 father of a four-year-old boy who goes missing from his garden, but CCTV footage tells a different story.
Jack directs an operation to keep rival football fans apart, but ends up unwittingly channelling a group of them into a dangerous situation.
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's.
A woman disappears after the man she claims to be her lover is found badly beaten in a hotel room, but when the assailant is found, nobody's story sounds convincing.
A man attacks the wrong person in a misjudged effort to take revenge on a boxing coach who abused him during his childhood.
A 15-year-old girl who was found wandering the streets covered in burns and bruises reveals that she had been groomed for prostitution.
A body found in woodland is identified as that of an 11-year-old boy who was not reported missing until two days after his disappearance.
Max discovers the dead boy's stepfather has criminal connections and, without telling Neil, orders an observation of the suspect 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.
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.