April Poole (Davies), a young writer in love with publisher Kerry Sarle (Tearle), visits the office of Mr. Sarle and his partner Ronald Kenna (Frank) and reads her latest story to them. She has made Sarle the hero, Kenna the villain, and herself the heroine. In the story, April changes places with Lady Diana Mannister (Marshall), who is being sent to South Africa to separate her from her lover, a young artist. A famous diamond that Lady Diana is to deliver at the end of her journey is given to April. Thieves trail her during her journey. With efforts by Kenna to steal the diamond prevented by the intervention of Sarle, the story comes to a close.

During World War I, John Stevens invents an anti-submarine device, but the plans are stolen by two German spies, the Baron von Wiederholtz and Madame Elsa, who flee to a New York hotel. Stevens' daughter Alice pursues the spies hoping to retrieve the plans.

Richard Gordon's lack of religious conviction prompts him to live a life of crime. When he demands to be included in a scheme to corner the food market, the conspirators agree to accept him as a partner provided that he contribute $100,000 to the operation. In order to obtain the money, Richard blackmails Harry Palmer with the aid of his girl