I like this episode except for the very end -- in the other episodes mentioned, he backup or some kind of "wild card" to play in case the killer actually acted. In "Guillotine," however, it seemed unlikely he'd be willing to lose his head in the event the killer decided NOT to kill him at that point. Of course, some careful listening to the dialogue might reveal that the killer did indeed intend to kill him and Columbo intentionally played right into his hands to catch him in the act. I'll have to look at that one again.