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ayden Danziger is on a cruise with his older but much, much richer wife Sylvia. Rosanna Wells is on the same ship, as its singer. Rosanna and Hayden were recently lovers, after which Rosanna began blackmailing Hayden; so, having decided to kill her, he has planned the perfect crime - or so it seems, since Lt. Columbo is cruising on that very same ship and the captain has asked for his help.

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