DS Steve Arnott believes there is a dark secret in Danny Waldron's past. But while DI Cottan is commended for cracking the Waldron case, the spotlight falls on Arnott's questionable conduct in a previous enquiry.

After the shooting at the drugs house, DC Kate Fleming uses her undercover role to increase the pressure on Danny Waldron's armed response unit. Meanwhile, a previous AC12 investigation comes under legal scrutiny.

Sergeant Danny Waldron and his armed response team shoot dead a hardened criminal.

AC12's investigation finally exposes a vicious criminal gang run from within the police.

Lindsay fights for her life as troubling details emerge of a vicious conspiracy.

Lindsay is granted special dispensation to visit her dying mother.

Lindsay finds herself targeted in prison and tells Kate her theory of why she is being framed.

Kate Fleming is planted undercover in Lindsay Denton's Missing Persons Unit.

A brutal ambush leaves three officers dead and a witness fighting for his life.

With Gates on the run, the anti-corruption team comes under pressure to close the case; Arnott is forced to make some tough decisions about his loyalties; Fleming and Hastings go all out to catch Gates.

Desperate for proof of Gates's corruption, Fleming pushes her relationship with him to the limit; her behavior causes Morton to question if she might not be such a loyal colleague after all.

Arnott is convinced Gates played a part in Jackie's disappearance; with Fleming's help, the anti-corruption team tries to trap Gates into revealing his involvement in covering up Jackie's crimes.

Having been duped into covering up Jackie's crime, Gates is desperate to sever ties with her; as Arnott and Fleming close in on his secret, Gates is plunged into a more dangerous situation.

Steve Arnott discovers his target is the city's top detective, Tony Gates.

The AC-12 anti-corruption unit, led by Ted Hastings, Kate Fleming and Steve Arnott, faces a new case as suspicions surrounding H's mysterious identity begin to point to someone they never expected: Hastings.

As the hunt for `H' intensifies, Steve and Kate can't help but wonder if Hastings is keeping a dark secret.

Tensions rise in the OCG following the events at Eastfield, and with troubling questions hanging over the identity of `H', suspicions mount at AC-12.

Corbett's most daring plan yet requires McQueen to exploit links with corrupt police officers; AC-12 makes a shocking discovery.

Kate and Steve attempt to track down a lead; a fresh police leak enables another audacious raid; Steve's attempts to gather information put him in a dangerous situation.

When three police officers are shot to death during the hijack of a seized-drugs transport, AC-12 move in to investigate possible police collusion; As the body count rises, the team realize they are up against their most destructive adversary yet.

While Nick Huntley faces lengthy questioning over his role in Tim Ifield's murder, AC-12 remain convinced of Roz's involvement.

The psychological thriller examines the lives of two hunters -- one is a serial killer who preys on victims in and around Belfast, Northern Ireland, and the other is a female detective drafted from the London Metropolitan Police to catch him. The local authorities have no suspects and no experience with cases involving sexually motivated serial killers; DSI Stella Gibson has. She heads a task force dedicated to solving the crime spree, with a simple motto: Anyone not part of the solution is part of the problem. The killer? He's Paul Spector, a father and a husband leading a double life, as viewers learn from the outset. He's hiding in plain sight, the protagonist in a cat and mouse game that is every police officer's worst nightmare.

When the corpse of an 11-year-old British boy, Danny Latimer, is found bloodied and dirty on an idyllic beach, a small Dorset community becomes the focus of a police investigation and media madness. Out-of-town Detective Inspector Alec Hardy gets the point position over Detective Sgt. Ellie Miller -- who feels the job should have been hers. Now she must engage in an efficient working relationship with taciturn Hardy. Slowly, more members of the community of Broadchurch are drawn into the investigation, with a telephone engineer drawing great attention when he admits to a special connection to the case. While dealing with so much unwelcome attention, Danny's family tries to cope with its grief. When a suspect is named and charged, the ensuing trial sees the defendant promising to expose more of the townspeople's secrets.

An obsessed man unable to accept the abduction of his young son spends years searching for him.

Detective Sergeant Nancy Devlin struggles to hide her longstanding connection to a drugs trafficker.