When Barry Corvall discovers that his new bride is a possible enemy agent, he resigns from the diplomatic service to go undercover to route out an espionage ring planning to destroy American industrial capability.

In the underworld of Manhattan, a woman dares to stand up to one of the city's most powerful gangsters.

A charming and very daring thief known as Arsene Lupin is terrorizing the wealthy of Paris, he even goes so far as to threaten the Mona Lisa. But the police, led by the great Guerchard, think they know Arsene Lupin's identity, and they have a secret weapon to catch him.

A medical researcher is sent to a plague outbreak, where he has to decide priorities for the use of a vaccine.