Led by Detective Superintendent Peter Boyd (Trevor Eve) the Cold Case Squad investigates serious crimes which have gone unsolved. Armed with the latest technological advances and old fashioned hard work, Psychological Profiler Grace Foley (Sue Johnston), Forensic Pathologist Frankie Wharton (Holly Aird), Detective Constable Mel Silver (Claire Goose) and Detective Sergeant Spencer Jordan (Wil Johnson) wake the dead for clues and answers.