Dick Van Dyke plays a crafty murderer with a well thought out plan to kill his termagant wife. His affable surface appearance contrasts shockingly with the cool calmness with which he commits first one murder and then another one to make sure of his own safety. Along with the serious murder story, this episode has some of the funniest little interludes of all the Columbo movies. I particularly liked the one where Columbo goes to a Catholic soup kitchen for information, and is mistaken by a well-meaning nun for an especially pathetic derelict. Naturally, the first thing she wants to do is to fix him up with a decent raincoat! The conclusion of the movie is almost perfect, but in the final analysis it relies on tricking the murderer into making a slip, and this time it seems a little too pat to be believable. However, that is a minor flaw, and this movie on the whole is one of the best Columbo mysteries.