A special sideshow torture exhibit has the power according to showman Dr. Diablo to warn people of evil in their futures. As skeptical customers are shown the greed and violence they're hiding one of them snaps and kills Diablo. When they run off we see the murder to be staged as part of the show. One of the customers has hung around to see this and wants to make a deal with Diablo aka the Devil.
A very good anthology of tales written by Robert Bloch and directed by Freddie FRancis for Amicus an icon of this kind of movie. The tales are uneven sure but they are all at least good till the perfect final one the Man who collected Poe with Jack Palance and Peter Cushing a great idea and a marvelous tale to watch. Very good Burgess Meredith as Diabolo the Great the host for these tales. Unfortunately for us all this kind of movies are a thing from the past and today we don't get any more gems like this. A must see