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.
Lance is missing on his wedding day, as friends try to 'cure' him of his homosexuality. Terry tries to prove his suspicions that brother Ben is a child abuser.
Ramani and Sim join forces in a bid to find out whether Terry's brother has been abusing his son.
The siege at the hospital takes a turn for the worse as Jack and Neil are taken hostage at gunpoint, leaving new DC Jo Masters to take charge.
Samantha begins to feel she's trapped in a never-ending nightmare when a confrontation with Abi leads to yet another revelation.
Hugh Wallis turns the tables on Sam Nixon by accusing her of abducting her own daughter as the tug of love moves toward a dramatic conclusion.
Sam struggles to prove that Hugh Wallis abducted, brainwashed and raped her daughter.
Sheelagh arrests a man accused of infecting women with HIV, but Leela is sure her colleague was motivated by racism.
Leela and Sheelagh find themselves at odds over the suspicious death of a baby and Honey accuses Amber of trying to ruin her relationship with Steve.
Amber's childhood friend is raped and Phil encounters a fellow sex addict, while Neil pours out his heart to Andrea.
June Ackland returns to take up the post of sergeant - and it's no secret she needs the money to clear Jim's gambling debts.
June leaps to Roger's defence after the leader of a gang of rowdy schoolgirls accuses him of indecent assault, and later plants a kiss on the startled copper.
Andrea is partnered with Gabriel, and finds a possible link to the Sun Hill sniper and learns of Dale's suspicions that June could be the crooked cop's mum.
Andrea fights to save her reputation by exposing Gabriel as the Sun Hill sniper - but editor Bruce Malcolm has other ideas.
Alan Kennedy is acquitted and with her cover blown, Andrea tries to expose Gabriel's crimes - only to be taken hostage by the crazed copper.
As Sun Hill station burns in the aftermath of the explosion, Gabriel makes good his escape, leaving Andrea trapped under fallen debris as the flames creep closer.
June is worried about Jim now that he's caught her with PC Valentine, and confronts him with the hard truth. Jim makes a big decision.
In the aftermath of the disaster, Reg is overwhelmed with grief at the loss of his soul mate, and Gabriel is hailed as a hero for rescuing Dale.
The trail of evidence against Colin Fairfax leads Jack Meadows and Jo Masters to a potentially explosive confrontation with him.
Following a number of assaults on the Asian community, Leela's father attempts to defuse the situation, only to be beaten up for his pains.
Leela urges her hospitalised father to make a statement about his attackers, and is warned her own life is in danger.
Gina faces the ultimate test of character when she learns she has cervical cancer, while Sheelagh comes to Gabriel's defence in a possible child-abuse case.
Gina keeps the news of her cancer secret, unaware Amber knows the truth, while Gabriel rescues schoolgirl Gemma and is rewarded with a kiss from Sheelagh.
Gina warns Amber not to tell a soul about her cancer, while Scott learns Greg's murder charges have been dropped.
Honey refuses to contemplate the prospect that Scott might have murdered his wife, while Lance tries to bring peace to the Cole Lane Estate.
Scott persuades Honey to set a date for their wedding, while PC Dan Casper arrives at Sun Hill, and risks life and limb to rescue a girl attempting to kill herself.
JT unwittingly puts a woman's life in jeopardy by sending her to the house of serial rapist Alan Kennedy.
Ramani reckons someone at the station was responsible for the hoax call to her ex-boyfriend. A drug dealer is shot dead on the Cole Lane Estate.
Mickey Webb returns to Sun Hill and tells Jack he suspects Neil is guilty of corruption, while Alan Kennedy lures Samantha into a trap.
Neil wonders if somebody's trying to frame him after his meeting with a witness is followed by her attempted kidnapping.
As Neil is hauled into custody, mutual mistrust begins to brew between the Sun Hill regulars and the National Crime Squad team led by Mickey Webb.
Margaret falls down a flight of stairs during a tussle with Ramani. Neil returns to Sun Hill, and Gina prepares to start chemotherapy.
Ramani is interrogated by Adam and Gina about events leading up to Margaret Barnes' fall. Gary investigates the alleged rape of a 13-year-old girl.
Honey prepares to lie on Scott's behalf in a bid to get him out of jail, while Gina tries to quell suspicion about her unexplained absences by going on the beat.
Honey's wedding day ends in a brawl, while Gabriel and Sheelagh put their kiss behind them and work as a team.
Adam's grief at the loss of his family in a fatal car crash is compounded by suggestions that wife Denise drove through a red light while on her phone.
Ramani is arrested for harassment, while Adam questions Tamsin Parker, the driver of the other vehicle involved in his family's death.
Terry races to Ramani's house, where an increasingly unbalanced Margaret Barnes is planning to commit suicide.
Ramani realises Terry has been stabbed and rushes home in a bid to save him, while Lance and Laura trace a suspect to a local pool hall.
Okaro tries his best to keep it together at the funeral of his wife, son and daughter.
Drug dealer Adi Mateen is forced to reveal his true identity in a desperate bid to save Lance from gun-brandishing local youth Jordan Tomlin.
Yvonne searches a storage unit hired by Honey's new husband Scott and finds a bloody glove, fuelling her suspicions that he killed his previous wife.
Honey finally confronts Scott, who breaks down and admits to killing his previous wife Karen, while Dan Casper has a humiliating run-in with three yobs.
Yvonne leaves herself open to charges of using excessive force to detain a suspect, and DI Morell investigates Honey's apparent abduction by Scott.
Honey fights to save her career, struggling to convince Adam she was abducted by new husband Scott. Meanwhile, JT begins to suspect Gina has cancer.
Shaken by the news that Yvonne has been suspended pending further investigation into Lee Thomas's death, Tony hesitates to use force in a confrontation.
Gabriel and Roger are disciplined for using their CS spray in a tense situation, prompting June to call the demoralised relief out on strike.
Adam tries to defuse the threat of strike action by offering to let Yvonne return to the station, while Rochelle suggests she and Dan pause their affair.
Gabriel wins brownie points by going easy on Laura's wayward son, while Adam tries to placate the officers by going out on the beat.
Neil pressures Gary to drop his bullying accusations against Susie Sim. Gabriel warns Sheelagh not to get involved with him.
Zain Nadir searches for a missing 14-year-old, and Gabriel tells Sheelagh that he deliberately killed the Sun Hill sniper.
Zain Nadir discovers Smithy has been canoodling with the wife of gangster Pete Larson.
Terry appears in court to testify against brother Ben, but reacts badly to being questioned about his own childhood abuse.
Phil's mum turns up at the station to lecture him on his responsibilities as a father-to-be. The case against Terry's brother concludes.
Gary is shot during a raid on a gang suspected of handling stolen goods, while Gina returns to work immediately after receiving cancer treatment.
Jack embarks on a search for the gunman who shot Gary, while Smithy and Jonathan call at Gina's house to see why she hasn't turned up for work.
Rochelle continues her steamy illicit affair with Dan, while Adam learns the Borough Commander has been sent photos of him smoking marijuana.
Ramani discovers Terry has been having an affair with his sister-in-law, while Jack takes over as superintendent and promotes Neil Manson to acting DCI.
Yvonne is summoned to hear her fate as the inquiry into the death of Lee Chapman concludes, and Jack is forced to arrest his own son.
Samantha and Ramani are forced to release Peter Baxter on bail, even though there is evidence linking him to the disappearance of nurse Manisha Devi.
A DNA sample seems to rule out cabbie David Russo of murder - until it transpires a recent blood transfusion that may have affected the result.
Teenage rapist Ross Trescot is brought into custody, but his arrest does little to comfort June, who insists on being interviewed by Sheelagh.
Yvonne sets off for Barton Street Station to face formal manslaughter charges but has a run-in with a drunk en route and ends up hitting him.
June is forced to deal with a date-rape case on her first day back at work, while a concerned Zain discovers Smithy is sleeping with Louise Larson.
Amber is paired up with Honey and sent to find the man responsible for two date-rape incidents, but puts herself at risk trying to catch the suspect.
Yvonne's trial gets under way and Jack is shocked to learn his son Ben may be the mastermind behind a drugs operation.
Yvonne learns her fate, and Smithy tells Sheelagh that Gabriel raped Kerry Young, while Gina makes a bad impression on new boss Amanda Prosser.
Gina is reprimanded by Amanda Prosser for her drunken behaviour, while Amber is entrusted with the task of telling a mother her son has been killed.
Neil Manson and estranged wife Pippa consider getting back together, while Gabriel takes the opposite course in his private life.
Jo and Suzie present Neil with incriminating photographs of his father-in-law, while Ross Trescot begs June to drop the rape charge.
Neil Manson learns his father-in-law, former Deputy Assistant Commissioner Roy Pearson, is being blackmailed over his involvement with underage boys.
PCs Hemmingway and Bryant challenge their male colleagues Valentine and Casper to a crime-busting contest. Amanda Prosser gets a stranglehold on Gina.
Amanda Prosser makes Gina the scapegoat for a bungled operation to detain a missing pensioner who is reported to be senile and carrying a loaded gun.
Jo Masters is assigned to look after a recently released child-killer who's jeopardised her new identity by disclosing it to a former acquaintance.
Sheelagh finally decides to accept Gabriel's marriage proposal, while Roger investigates an assault on his estranged wife's new boyfriend.
Amanda Prosser's insensitive treatment of a bereaved father provokes a hostage crisis, and the real Gabriel Kent turns up in Sun Hill.
Distraught dad Jeff Clarke holds the Sun Hill stalwarts at gunpoint, prompting a desperate response from Dan Casper - who ends up getting shot.
Adam Okaro returns to Sun Hill, where he resumes his role as Superintendent - and immediately asks Jo Masters to find out how the press got a photo of Lesley Palmer.
Jo Masters and Samantha Nixon continue to hunt for the missing Lesley Palmer - a case given added urgency by the subsequent disappearance of her ex.
Terry investigates an attack on his sister-in-law.
David Kent returns home and catches wife-to-be Sheelagh going through his belongings. Realising time is running out, he resorts to desperate measures.
Leela investigates a 'happy slapping' incident, and Adam tries to quell gossip about the bogus Gabriel Kent's fatal fall.
Zain looks into the case of a girl who has been reported missing twice in one day. Amber continues to tease Dan about his love life.
Jo Masters goes undercover as a warder at Stonewall prison to investigate the source of drugs which have led to a spate of overdoses.
Jo Masters realises Cath Wilson has used her to establish herself as top dog on the wing and sets out to get revenge.
Zain Nadir finds a witness to the Garrison shooting, but a search for the gun puts Dale Smith in grave danger. Amber Johannsen discovers Dan's affair.
Smithy ignores a warning from Louise and rashly continues searching Larson's home for the gun used in the Garrison shooting.
Ian Barratt and Dan Casper team up on an armed robbery case, while Jack Meadows asks Mickey Webb to help his ex-colleague capture a dangerous rapist.
Dan Casper and Commander Barratt get a result on the armed robbery stakeout and celebrate by slugging out their love triangle dilemma in front of Rochelle.
Gina Gold gets a warm welcome back at Sun Hill, but Sheelagh Murphy has a crisis of confidence as she reports for duty following the death of fiance David Kent.
As the coroner's hearing into the death of David Kent approaches, June Ackland nervously prepares to meet her long-lost son Gabriel.
Zain Nadir is reluctant to work with returnee Mickey Webb, but soon learns to appreciate his off-the-record skills.
Lance Powell goes undercover at a gay bar and helps Webb and Nadir arrest a dealer selling lethal crystal meth.
Neil Manson returns to Sun Hill to work on the murder of a gay man, and Phil Hunter spots a pattern in similar recent crimes.
An anonymous caller alerts Phil Hunter to common threads in recent murders, and the team starts looking for a serial killer on the Sun Hill gay scene.
Adam Okaro pulls out all the stops in the investigation of the murder of Lance Powell, and enquiries lead the team back to Radar barman Michael Keenan.
The Sun Hill detectives grill suspected gay serial killers John Lord and Michael Keenan and get deeply embroiled in a battle of wits.
A well-known footballer is accused of rape. Adam Okaro gains a deeper insight into the hidden life of murdered colleague Lance Powell.
New PC Will Fletcher gets off to a bad start at Sun Hill, but a successful investigation into a spate of robberies.
Gina Gold organises mock game show Cop the Lot to snare prolific offenders who repeatedly fail to turn up at court, but Amber Johannsen's carelessness threatens the operation.
A judge is caught driving under the influence, jeopardising the outcome of a court case. Honey declines Will's offer of a date, while Tony visits his father's home.
Terry goes to visit his paedophile brother on his release from prison, and agrees that he will try to convince Lucy to let him see the children.
It's an emotional time for Terry as he starts searching for his missing nephew. Will tries to clear the air with Honey over making a move so soon after Scott's death.
Amber's bad attitude and poor performance put her on the wrong side of Gina, who tells the flighty young PC she wants her out of the force.
Smithy tells Gina he's considering leaving the job and joining Louise in witness protection, while enough's enough for Amber, who hands in her resignation.