Pilot: After an attempt to rescue a kidnap victim goes horribly wrong, Supt. Sandra Pullman, the officer in charge who shot a dog during the raid, is reassigned. DAC Donald Bevan puts her in charge of UCOS, a new unit focusing on unsolved cases. There are no resources available, but Sandra is authorised to hire retired detectives and turns to her mentor, Jack Halford, to help her assemble a team. The first case is the murder of a nightclub waitress in 1981 when the accused, Roddy Wringer, is released after 21 years in prison when one of the officers on his case is found to have been corrupt. Bevan is convinced Wringer is guilty and makes it clear that he expects Sandra to prove that.