Brimmer, a short-tempered private detective, is hired by Arthur Kennicut, a prominent Los Angeles publisher, to investigate the publisher's wife's activities under suspicion of an extra-marital affair. When Mrs. Kennicut is found murdered it's time for the real detectives to take over. Enter Lieutenant Columbo, the cigar-smoking detective in a rumpled raincoat, who does not accept the murder-by-mugging theory surrounding the woman's death. When Kennicut assigns Brimmer to assist Columbo in the murder investigation, Brimmer struggles to deflect Columbo's increasing suspicions that he was involved in Mrs. Kennicut's demise. Stars Peter Falk.