An unpleasant pleasure cruise in which a host victimizes his guests with his knowledge of their paste, and tantalizes them with the money they will receive for the successful solution to his murder, leads to a well premeditated death. Those on board, ill sorted and for the most part ill tempered, sustain an atmosphere of uneasiness to which lethal attacks, illegal drugs, and the mutiny of the crew all contribute. There's not much missing- unless it might be plausibility.