Marie (Nilsson) is a successful but emotionally distant prima ballerina in her late twenties. During a problem-filled dress rehearsal day for a production of the ballet ''Swan Lake'' she is unexpectedly sent the diary of her first love; a college boy called Henrik (Malmsten) whom she met and fell in love with while visiting her Aunt Elizabeth and Uncle Erland's house on a summer vacation thirteen years before. With the cancellation of the dress rehearsal until the evening Marie takes a boat across to the island where she conducted her relationship with Henrik and remembers their playful and carefree relationship.