From the moment they met, it was murder. Unsuspecting Mr. Dietrichson becomes increasingly accident prone after his icily calculating wife encourages him to sign a double-indemnity policy proposed by a smooth talking insurance agent. Against a backdrop of distinctly Californian settings, the partners-in-crime plan the perfect murder to collect on the insurance. Perfect until a claims manager gets a familiar feeling of foul play and pursues the matter relentlessly. Tension soars as the would-be lovers find themselves plotting against each other.