A fleeting encounter in a train station draws a withdrawn young man into a shadowy world of desire and danger. As obsession deepens, innocence destroyed, and an irreversible transformation begins.

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.

Stuck in a loveless marriage, bourgeois industrialist Francois falls in love with Janine, another man’s wife. Francois sets up Janine as his mistress, and she, mercenary soul that she is,…