Free-lance undercover agent Coplan receives a phone call from an old girlfriend in Turkey. The panic-stricken woman gives sketchy details of a plot that threatens world security. When Coplan arrives, he is told the woman has been killed, and the trail of the murderer leads to her mad-scientist brother.

Secret Agent Francis Coplan, is given the task of finding priceless artwork stolen by the Nazis' in 1943. The trail leads to Mexico, where Coplan challenges a "secret" organization in order to re-gain the paintings.

In a factory working for the National Defense, an employee steals a prototype. In charge of the investigation is Francis Coplan.

A French agent, who is sent to save an atomic scientist, uncovers a plot by terrorists and a secret atomic site in Turkey.