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Loving husband Charles (Bernard Blier) brings his handsome young friend Maurice (Michel Auclair) home to meet his wife, Fernande (Madeleine Robinson). Charles' equally loving missus is delighted to have Maurice as a guest. A little too delighted, as it turns out. In the course of a single evening, Fernande and Maurice become lovers, then conspire to murder poor Charles. There are too many plot twists to detail here--and besides, it isn't fair to give away surprise endings. Suffice to say that, despite the farcical nature of the plot, L'Invite du Mardi is anything but amusing...especially to the character played by Bernard Blier.