Paris, spring 1968. While most students take the lead in the May revolution , a French poet s twin son Theo and daughter Isabelle enjoy the good life in his grand Paris home. As film buffs they meet and adopt modest, conservatively educated Californian student Matthew. With their parents away for a month, they drag him into an orgy of indulgence of all senses, losing all of his and the last of their innocence. A sexual threesome shakes their rapport, yet only the outside reality will break it up.