Jacques Decrey, an industrialist, finds out that his wife Gloria has a lover. Posing as a man named Berthier, he blackmails her. After a while, Decrey decides to make Yves Normand, a young unemployed actor and Gloria's lover, out to be the blackmailer. But doing so he has set off an infernal machine...A wealthy industrialist discovers his wife is having an affair and decides to exact revenge by blackmailing her under an assumed identity.