Lovers Marianne (Romy Schneider) and Jean-Paul (Alain Delon) spend their vacation in a villa near St.-Tropez. The main feature of the villa is a swimming pool, stage for most of the action. After a visit, Marianne invites former lover Harry and his teenage daughter Penelope to stay. Tension between the grown-ups rises especially when Jean-Paul seduces Penelope. The consequences are deadly. Jacques Deray’s restored erotic drama about the tangles of a Swinging ’60s "ménage-a-quatre" is both sophisticated and shallow, with a dip into violence making a splash.