Juliet Forrest is convinced that the reported death of her father in a mountain car crash was no accident. Her father was a prominent cheese scientist working on a secret recipe. To prove it was murder, she enlists the services of private eye Rigby Reardon. He finds a slip of paper containing a list of people who are 'The Friends and Enemies of Carlotta'.
Shortly before the start of WW2, renown British big-game hunter Thorndike vacationing in Bavaria has Hitler in his gun sight. He is captured, beaten, left for dead, and escapes back to London where he is hounded by Nazi agents and aided by a young woman.
The US Government tries to track down embedded Nazi agents in the States.
Reporter Michael Gordon uncovers intrigue in Damascus, where the Allies and Nazis struggle for control of Arab sympathies.
A forger steals and kills for a rare book from a library in order to make forgeries to sell to rich suckers.
A forger is forced to work for a Nazi spy ring. His conscience gets the better of him, though, and he secretly conspires with the FBI to turn over the gang.