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 for various reasons all opted for early retirement. In Series Five the team all face their demons. Ricky Hanson's trial is finally upon them and they all give evidence but will Hanson get away with the murder of Jack's wife? The team also delve into the world of organ donation, discover the truth about radio DJ Johnny Deacon and probe the secrets of an MOD research unit. Gerry meets his heroes when they look into the death of the lead singer of Bad Faith, Brian struggles with his alcohol addiction and Sandra uncovers painful truths about her father. UCOS continue to bend the rules, use their own methods and test Strickland's patience to the limits. However to overcome the tribulations of both their professional and private lives they must pull together and support each other more than ever.