In a sudden turn of events, the Fiendish Mastermind calls the Supper Club to London to solve the mystery of a new criminal genius who is even more fiendish than he ever was! Sherlock Sam, Watson and the Supper Club have to race against the clock to discover the brains behind the crimes that have left the London police baffled. The thrills and restaurants of London will have to take a backseat as Sherlock Sam and gang come head-to-head with their most devious adversary yet!