Another case for Detective Chief Inspector Barnaby (John Nettles) and Sergeant Troy (Daniel Casey). The death of aristocrat Sir Freddy Butler brings Barnaby and Jones to the privileged surroundings of Haddington Hall. When Sir Freddy invites his family, including both his ex-wives and the current Lady Butler, for dinner he suffers what appears to be a heart attack. When his Will disappears and his lawyer is killed in an arson attack, the detectives close in on Freddy's family. What are they hiding - and where are the mysterious Haddington emeralds?