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Peg Beale (Anne Francis) is fed up with her marriage to wealthy toy manufacturer Ted Beale (Robert Strauss), a boorish, thick-witted practical joker. Nor is Peg happy when Ted hires as his new assistant the handsome, college-educated John Cochran (Donnelly Rhodes) -- mainly because John has already seen Peg in the arms of another man. Before long, however, Cochran himself has fallen under the spell of the promiscuous Peg, who hopes to use John as a pawn in her scheme to murder her husband.