In 1958, on an island beyond the North Sea, a tournament of deduction is hosted by the last of a once-defunct criminal enterprise. Invited are an assortment of personalities that find there are few strangers amongst them, but all are promised a solitary reward for the eventual winner: "No wish will go ungranted". However, the specialized device each player now wears is used not only to participate in the game but compel them toward revelations none