Bill Pendleton, a happy-go-lucky college student adept at both flying and football, accepts a wager from his fraternity pals that he will propose to any girl in the college they choose. Mary O'Mallory is chosen and, unaware of the wager, accepts Bill's fraternity pin, Bill having proposed to her in earnest. But Mary hears about the wager and, thoroughly disgusted with Bill, leaves college and goes to China to join her missionary father. A remorseful Bill follows her there and redeems himself by rescuing Mary and her father from a band of revolutionaries.