Henri est convaincu que Lise, sa nouvelle et jeune femme, l’aime sincèrement. Henri est aussi convaincu que Sam, le témoin de leur mariage, est le frère de Lise. La machination est parfaite. Enfin presque...

During an investigation, private detective Marie Machiavelli discovers that the former head of a law firm embezzled several million francs belonging to Jewish clients whom he never attempted to contact after the war.