 "One round" Jack is a boxer who fights in bazaars. He is engaged to Nelly. Without revealing his true identity, the Australian champion Bob Corby, who is falling in love with Nelly, challenges Jack. "One round" loses and Bob, who wants to be close to Nelly, hires Jack as his sparring partner. A short time passes until Bob and Nelly run away together. Jack is now in training for his revenge. He challenges Bob in the Albert Hall.