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Suze (Kerry Fox) and Big Dave (Tamer Hassan) offer tourist cruises on their New Zealand--based yacht. En route to Fiji with two troubled couples, they answer a distress call and rescue the Greek (John Rhys-Davies), whose body is possessed by an ancient demon that uses a magic dagger. Once the spirit stabs someone, it moves into their body, and the former host dies. When the Greek is thrown overboard after he stabs a passenger, the demon's soul begins working its way through everyone on board. Wikipedia