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Patrick Kinsley and Cathleen Calvert are having an affair. She would very much like to leave her very rich husband Clifford Calvert but there is an iron clad prenuptial agreement that will leave her nothing if she divorces him. They briefly discuss killing him but then comes up with an idea: instead of killing him, while don't they kill someone else and frame him for the murder. She has a perfect candidate in Howard Seltzer, a dissatisfied business associate who is suing Clifford. They were even involved in a scuffle a few days ago, before many witnesses. Patrick Kinsey does the killing and thinks it can't go wrong - he's a forensic specialist for the LAPD and is assigned to the case. Lt. Colombo has a keen eye and a cigar butt combined with Kinsey's good manners is all he needs to realize who the killers are and set the bait to trap them.—garykmcd imdb.com