Someone is stealing priceless paintings from the great museums of the world and replacing them with nearly flawless forgeries. Leonardo da Vinci's "Madonna and Child" is being shipped to London's Tate Gallery for a special exhibition, and Paul Mitchell is assigned to protect it. Upon the painting's arrival, Paul realizes it has been switched. Eager to collect the museum's $50,000 reward, he teams up with Mary Mason, a Tate employee, to recover the original.

Special Agent Dick Barton uncovers a ring of international psychopathic criminals with plans to dominate the world using a terrifying weapon of mass destruction.

Murder drama set in Soho involving a police inspector, a newspaper reporter and a country girl.

Government agent Dick Barton battles a ring of Nazi spies who are planning to poison the entire London water supply.