Shrewd, scruffy, and personable L.A. homicide detective Lieutenant Colombo questions a suspect and his girlfriend to find out what they were doing at particular times of the weekend. They don't know, however, that he’s withholding certain evidence that could prove whether or not they’re telling the truth.

A pile of coins from a parking meter holds the key to solving the murder case. When Susan, the prime suspect’s girlfriend, is confronted with compelling evidence, will she change her story and abandon her man?