The Diablical Mr. Franco explores the life and times of Jess Franco, the creator of the first Spanish porn films. His more than 200 films include Vampyros Lesbos, about a mysterious countess who lures young women back to her castle, and Necronomicon, adapted from a medieval book on the occult. The film includes interviews with Monica Swinn, Jess Franco, Michel Lemoine, Daniel Lesoeur, and Nigel Wingrove.