The betrayed sailor returns to Concarneau
Years earlier, three Concarneau café regulars (the doctor Michoux, Le Pommeret, and the journalist Servières) drew a young sailor, Léon Le Guérec, into a cocaine-smuggling venture, then abandoned him when it collapsed; he was caught and imprisoned in America. When he returns, a hulking figure trailed by a stray yellow dog, a shooting, a poisoned bottle and a staged disappearance throw the town into panic, and the outsider is presumed to be the danger. Maigret's investigation shows that the respectable notables' own guilt and fear produced most of the violence, and he lets Léon and his fiancée Emma, a café waitress, go free.