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lectronics expert Harold Van Wick has wired his estate-home with closed-circuit television cameras and video recorders. His costly fascination with gadgetry raises the ire of his frugal mother-in-law, who owns the firm where Van Wick is the chief executive. She orders him to resign, threatening to reveal his philandering ways discovered by her private detective, but Van Wick has already set in motion a scheme to murder his angry mother-in-law, recording her demise on video tape while feeding a recording of an empty study to the guard monitoring the estate's rooms on television screens at the gate to the Van Wick estate. Having already forced open a window and planted footprints outside it to make the kill look like the deed of a burglar, Van Wick timer-sets the recording of the murder to play while he is away at a social function, thus giving him an alibi. But Lieutenant Columbo - that super-smart detective in a rumpled raincoat - suspects Van Wick and asks incessant questions as he probes the murder and tries to link it to him.

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