Simple conversations engender complicated human interactions. Jeanne is open and even-tempered, a philosophy teacher at a lycée. Her fiancé is away and she doesn t want to stay at his messy flat; she s loaned hers to a cousin, so she accepts the invitation of Natasha, a music student whom she meets at a party, to sleep in her father Igor s bedroom because he s always with his young girlfriend, Eve. Natasha tells Jeanne a story of a missing necklace and her suspicions of Eve. They all meet at dinner, then again at Igor s country house. Is Natasha scheming to get Igor and Jeanne together alone? Once alone, what determines how they choose to act? And the necklace, what of it?