 Doctor Ray Flemming is a psichiatrist, he is married to Carol who is a rich woman and one of his patients is Joan Hudson who is also his lover. Ray decides to murder his wife with Joan s help. And so he does, making sure he has a perfect alibi. Lt. Columbo is in charge of the investigation and he is almost sure that Doctor Flemming is guilty. So a duel starts between the cold Doctor and the seemingly naive detective.