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 policeman, Gerry Standing, Jack Halford and Brian Lane, who for various reasons all opted for early retirement. Series Three finds them investigating a teacher's mysterious car crash death; a murder involving misappropriated Union funds; violent dog killings, witchcraft, ice cream bandits at war and arson. Employing modern cutting edge forensics UCOS doesn't always adhere to strict police procedures and often resorts to unconventional methods to close a case. However, the veterans battle on, fighting dizzy spells and advancing years to right the wrongs of the past.