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Nestled in the enchanting European city of Leisure, Jack and Elvira, a married couple, engage in a provocative wager about their seductive prowess. After a wild evening with tourists they met through a newspaper ad, Elvira, who prides herself on her discerning tastes, believes she can charm newlywed Betsy, who is wed to dashing marine biologist Eddie. If she doesn't succeed by midnight, Jack will have the chance to pursue Eddie himself, setting the stage for a tantalizing game of attraction and rivalry.