Ian McShane stars as Peter Curtis, who has just been released from prison after serving four years for manslaughter. His victim's mysterious last words lead him on a frantic quest for answers in the tidal estuaries of the West of England, where he finds himself on a collision course with other parties who are as eager to solve the mystery as he is, and are seemingly even prepared to kill to find the answer.

Billy has just scored an entry-level position with the local crime cartel. His first job is to mind Jason, a newly released thug with a vicious temper. Jason thinks it's his job to teach Billy about crime, drugs and women. Little does he know that Billy has his eyes on Jason's own wife, Lisa. When an ecstasy deal goes bad, Jason vows revenge on the boss, while Billy looks to take out Jason. Before long, bodies start turning up

Sherlock Holmes and Dr. Watson try to track down the Great Mogul, the second-largest diamond in the world.