Detective Superintendent Sandra Pullman heads The Unsolved Crime and Open Case Squad (UCOS), cracking previously unsolved crimes from the past. Her team are three ex policemen; Gerry Standing, Jack Halford and Brian Lane, who have all opted for early retirement.

In series 7 they reopen a case when the victim’s daughter provides new evidence - from a psychic. A fashion designer’s retrospective reignites the mystery of his stabbing during a party eight years ago. When the team are approached by a known paedophile who confesses to murder they find themselves trying to prove his innocence. A woman on remand brings information to UCOS about an apparently accidental fire 14 years ago and an old adversary brings them fresh information on a 30 year old bank job that threatens to finish the unit forever.