Prescription: Murder

“The perfect crime had one flaw.”

A woman is dead, and the man with the airtight alibi is her husband, Ray Flemming (Gene Barry), a psychiatrist who is also seeing a patient, Joan Hudson (Katherine Justice). Richard Irving sends in Columbo (Peter Falk), a lieutenant who seems to forget what he came to ask. He keeps coming back with one more question, and Flemming has to decide how much of it is an act.