Jean-Paul is an out-of-work writer having an affair with Marianne, a successful journalist. As they frolic in a swimming pool in St. Tropez, she receives as call from the record executive Harry. He arrives with his nubile young daughter. Harry and Marianne were once lovers and he makes a pass at her. Meanwhile, Jean-Paul makes a pass at Harry's daughter. After some drinking, Harry and Jean-Paul fight, resulting in Harry being pushed into the pool. Jean-Paul refuses to help the struggling man as he drowns and the young couple tries to get their stories straight in order to avoid being charged with murder.