As Dominique Marceau is being tried for the murder of Gilbert Tellier, accounts by different witnesses paint a picture of the kind of relationship the two used to share.
Police Commissioner Jules Maigret returns to the small village where he spent his childhood at the request of the Countess of Saint-Fiacre, who has received a disturbing anonymous letter.
Agnes, a lonely teenage girl, and her father befriend an escaped convict, named Joseph, who arrives at their farm in Brittany, France. When Joseph develops an attraction to Agnes, her father threatens to break up the union.