Challengingly stylish and original, Ma Mre is the story of Hlne (Isabelle Huppert), cool and in charge, her husband, and her teenage son Pierre (Louis Garrel), a pious Catholic boy back from boarding school. As Hlne confesses to her son about his father’s infidelity, they hear he has been tragically killed in a car crash. This news sets in motion a wild series of parties involving drugs, alcohol and sex-filled nights out with Hlne and her female lover. Inexplicably, she pulls her son into her sordid lifestyle. When she mysteriously goes away, her son is left in the care of her mistress Ra (Joana Preiss) and Hansi (Emma de Caunes), an icy blonde sadist with whom he falls in love.