Inspector Maigret has a nasty job to do. He must visit a prisoner he arrested to tell him he will be executed at dawn. But the condemned man tells Maigret a story about something he saw years before. About a body dumped in a canal. About blackmail. About seeing the murderer again not long ago . . . There's probably no point in checking it out now, but the determined policeman still finds himself in a seedy bar to investigate. Is the murderer still one of its regulars?
Maigret has a funny feeling about this case . . .