Gallagher is shot down in a P-51 Mustang on a secret mission. Joe is captured and beaten by the Germans, while on the way to the hospital he escapes with the aide of a beautiful girl. She is part of and underground, a conspiracy is led by Admiral von Kreuter, who is her father. The German major is part of the plot to kill Hitler, Joe meets with the group and is captured again, and escapes and steals and airplane to bring the Admiral back to England and negotiate a separate peace.