Small-time smugglers Mitchum and Lemmon pick up transient tramp Hayworth, taking her along on their small boat through the West Indies so she can get a passport in the fictional Santa Nada, where no questions are asked. Lemmon falls for the sexy Hayworth despite the warnings of
woman-wise Mitchum, and Hayworth herself tells Lemmon, "I'm no good for you, no good for anyone. Armies have marched over me." Nonetheless, Lemmon is fascinated by the hard-bitten passenger, an infatuation that turns into insane jealousy when Hayworth and Mitchum are, inevitably, drawn to each
other. This leads to a falling out between Lemmon and Mitchum, after which Mitchum goes off in a hu...