Bishop Archibald Soper (Louis Jouvet) pops in for a chat with cousin Irwin Molyneux (Michel Simon). Like Irwin, his wife, Margaret (Francoise Rosay), dislikes Archibald, so makes herself scarce. Archibald is curious about what’s become of Margaret, and Irwin — a scientist whose work as a moonlighting mystery writer has sharpened his skills of imagination — makes up an excuse to explain his wife’s absence. But this leaves the paranoid bishop thinking that his cousin has murdered his wife.