Pullman seizes the chance to solve a murder that she believes is linked to her first ever case, and the team start putting together a jigsaw puzzle of suspects from a photograph taken in a London park in the 90s. Eventually faced with increasing pressure to hand over the investigation, Sandra makes a huge decision, which is going to change UCOS forever.

Gerry attempts to clear his name before his enemies catch up with him. Sasha and Steve get Fiona's help to examine the evidence against the clock. Danny takes Gerry on the run as they look for the proof they need to prove his innocence.

Brian Lane enters rehab to treat his alcoholism, but the rest of the team soon join him.

The team find themselves at the centre of a shocking cover-up.

The team exhumes the body of a car crash victim after claims she has been seen alive.

When the gun used to murder a talented young boxer 11 years ago surfaces in an armed robbery, UCOS are drawn into the darker side of professional boxing in a case that causes conflict and friction among the team.

Retired DI Steve McAndrew from Glasgow joins the team to reopen one of his old cases when the DNA of a woman who went missing as a teen turns up at the scene of a petrol station robbery.

The team unlock over three decades of secrets and lies on the Rock of Gibraltar and find the link which solves the murder of a playboy shipping heir from '98 and a young local boy from '82. With both cases solved, they return to England where Lane faces a disciplinary hearing, dragging up a death in custody from his past which threatens his career in UCOS.

The team investigate when a skeleton is uncovered in the foundations of a swimming pool.

Gerry feels spooked following the discovery of UCOS's latest victim, a policeman, whose body has lain untouched under a basement for the last 30 years. Accusations of police corruption and underhand dealings start to surface causing Gerry to face up to some skeletons in his own closet.

With Sasha back on fighting form, UCOS investigate the death of a cricket prodigy.

The Metropolitan Police set up a new unit, UCOS, which stands for Unsolved Crime and Open Case Squad, to investigate previously unsolved crimes. Led by Detective Superintendent Sandra Pullman, the team is made up of retired policemen Jack Halford, Brian Lane and Gerry Standing. Their first case is to investigate the murder of a nightclub hostess. The man who was convicted of killing her is released on appeal after serving twenty years in prison, having always claimed his innocence. The renewed investigation eventually produces proof of his innocence, but also his guilt of a different murder. In the end the team finds proof that the man's wife killed the nightclub hostess out of jealousy.

UCOS investigate into the death of a policewomen-whose case was closed years ago-following the recovery of the murder weapon from a lake.

The UCOS team investigate the murder of a young peace protestor, killed at the outskirts of a nuclear base in 1984, and realise that they may be in danger of exposing a Special Branch cover up.

When a missing person case which Lane originally investigated gets re-activated, he's determined to crack it. But when the team swiftly uncover another two mysterious disappearances, they start to think they've got a serial killer on their hands.

In an attempt to make contact with his late wife Mary, Jack goes to see a clairvoyant. Instead he meets a girl who died in a shipping container in 1982 and has the case re-opened.

Deputy Assistant Commissioner Robert Strickland is the new boss in charge of the Unsolved Crime and Open Case Squad (UCOS). He asks the team to look into the death of David Barrie, a top barrister found in his car in 1980 after being bound and gagged.

In 1996 a beautiful newlywed, was attacked and left for dead. The only thing taken was her wedding ring and she has been in a coma ever since. The man jailed for the crime is now a born-again Christian and is protesting his innocence

The team re-examine the case of Hannah Taylor who was kidnapped from her home in 1992. A body, previously thought to be Hannah's, has just been identified as that of another kidnap victim

Tabloid editor Chris McConnell asks Sandra Pullman to help him prove celebrity chef Kitty Campbell killed her drunken husband Bertie 40 years ago at the height of their 60s TV fame.

Attractive widow and probate assessor Elise Allen asks Halford to find the rightful owner of a large, uncut red diamond, worth £15 million. She found the rare jewel in a flat rented by John Newman who died in 1982.

Luck turns against Standing when he loses a poker game, owing bookie Michael Jacobs £10,000. But Michael offers him a chance to clear his debt by finding out what happened to his dad Joe, who died after being mugged outside Walthamstow stadium in 1983.

Lane indulges his obsession with fishing when UCOS investigates the case of two boys abducted from a fishing lake in 1979, believing it could be linked to a recent spate of snatches near the M25.

The Home Office pathologist asks the team to identify the remains of an unidentified woman, whose remains were found back in 1987. These remains are the only body that he was unable to identify. With his help and that of his attractive assistant, not only must the team identify the body bits, but how she died and who killed her.

A car in which five years ago a teacher was murdered is returned to the victim's husband. Pullman re-opens the unsolved case, hoping her team can track down the dead woman's secret lover, and a clue soon leads them to a male prostitute. Pullman had worked on the original case and been troubled throughout by the lack of emotion shown by Nancy's husband Stephen