The Ballet Dancer.

The ballet pupil Camilla Favier makes for a quick success and falls for the author Jean Mayol. She discovers a love letter to him from a rich married woman and is devastated. In revenge she reveals the secret love story for the cuckolded husband and his guests at a big party. Later she finds a new love message from the wayward wife and brings it to the husband, who gets furious, grabs a pistol and incites the climax of the story.