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Lumber tycoon Bill Fleming (Paul Douglas) knows that his wife, Laura (Dody Heath), is unfaithful, but he draws the line at killing Laura's love, Philip Baxter (Hugh Marlowe). However, Fleming changes his mind when a young acquaintance named Sandy (Robert Morse) cites an archaic but still viable law, which declares that Fleming cannot be prosecuted if he kills his rival in a duel. What Sandy doesn't tell Fleming is that this law has its own peculiar conditions.