Jack Novac, Indy 500 winner, plans a new assault for the 1934 Championship with his two fabulous Miller front drive race cars. Then the rules change and his Millers are not eligible. When a retired army general offers to sponsor Jack on a barnstorming tour of Europe, Jack is unwillingly drawn into the intrigues brewing in pre-war Europe. The General sees Jack's show as a perfect cover for gaining access to manufacturing plants in Italy and Germany.

Jack breaks Europe's speed records, drawing record crowds. But murder and espionage seem to follow him around and everyone but Jack seems to think he's a spy. When a high-ranking Nazi official's wife disappears, Jack becomes his target for revenge. Jack thrills the crowds while racing to stay one step ahead of dying.