Onoff is a once-famous French writer who has remained out of the public eye in recent years, but when the police spot him running in the rain in the general vicinity of a murder site, they take him into custody for questioning. Confronted by the inspector, Onoff claims that he has no recollection of the evening's events, resulting in a back-and-forth between the two men that may or may not result in the uncovering of the truth.