Les Parents Terribles was adapted by director Jean Cocteau from his own stage play. Yvonne de Bray plays a manipulative, possessive mother, married to weakling Marcel Andre. At present, Yvonne is violently opposed to the impending marriage between her son Jean Marais to Josette Day. It gets more complicated than that: Day is Andre's mistress, who in turn is coveted by de Bray's sister Gabrielle Dorzat. These stunning revelations loosen the hold that De Bray has on her household. Her power gone, she seeks solace in self-destruction.