Taxi driver Terry Donnelly is found dead in his cab outside Houston's jewellers shop. His body is discovered by Davie Houston (Robert Carr) and his family on their return from the funeral of Davie's daughter Julia. Davie and his brother Billy (Tom Mannion) deny all knowledge of the deceased, as does Davie's son Charles. DCI Burke (Alex Norton), however, feels that the Houston family is at the heart of the case. But what is the connection between the criminals and a respectable jeweller - or is something else driving the killer to kill?