Joy Street: Mimi, an unsophisticated American girl attending an exclusive Swiss boarding school, unexpectedly inherits a large fortune. Returning to the United States she quickly begins to live a wild and reckless life. Good-natured Joe attempts to set her straight, but she keeps right on living riotously. It takes Mimi a serious accident while joyriding to comes to her senses and realize she is ready for a more settled existence.