England, 1939. Geraldine Fitz-Herbert, stifled by her aristocratic upbringing, has always found solace in the sky, the one place she can be truly free and push all limits.

As war breaks out, Fitz seizes an opportunity to put her flying skills to good use when she sees an advert for volunteers at the Air Transport Auxiliary.

But a chance meeting with American Flight Officer Sam Carter suddenly turns her world upside down. Embarking on a passionate and high-octane affair, Fitz has never known a love like this before and starts to dream of a future together, only for the reality of war to hit.

When her years of linguistic training are discovered, Fitz is sent on a top-secret mission to join the local resistance in Brittany. Brave and determined, she commits to the operation with her whole heart, but on arrival, she faces a horrifying sight: the Germans lying in ambush.

Manging to evade capture, Fitz is now stranded all alone in enemy territory without any back up or help. As she battles to get herself home, can Fitz find her way back to safety and to her life with Sam?