Tender Is the Night

Dick and Nicole Diver are a glamorous couple who take a villa in the South of France and surround themselves with a circle of friends, mainly Americans. Also staying at the resort are Rosemary Hoyt, a young actress, and her mother. Rosemary is sucked into the circle of the Divers; she becomes infatuated with Dick and is also adopted as a close friend by Nicole. Dick toys with, and later acts upon, the idea of an affair with Rosemary.
Rosemary senses something is wrong with the couple, which is brought to light when one of the guests at a party reports having seen something strange in the bathroom...