Drama / Characters: 4 males, 3 femalesScenery: 3 interiorsThe TV series was based on this play. A brilliant psychiatrist and his mistress hatch a plot to murder his neurotic, possessive wife that depends on a bizarre impersonation to create a perfect alibi. Lt. Columbo and the doctor engage in a cat and mouse duel of wits until the doctor succeeds in having Columbo removed from the case. But the mistress is the weak link that leads to a trap and a surprising climax.