The movie begins with the mysterious murder of Adolf Schwartz, whose bathtub is filled with a piranha fish. As the investigation unfolds, attention is diverted by the arrival of Margo Winchester, a stunning hitchhiker who captivates the local men. The film's climax features a series of surprising plot twists, revealing that many characters are actually disguising their true identities.

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A gruesome bathtub murder sets off a thrilling whodunit, as a complex web of unanswered questions and suspects unfolds.