1939, France: Lavish parties, fast cars, and a closet full of the latest fashion--to the average eye, socialite Violet St. Croix seemingly has it all. But what she truly wants is a life full of meaning and purpose. So when France falls to Germany, Violet defies her parents' wishes and joins the war effort. With her impeccable skill for driving under pressure, she is soon sent to North Africa to shepherd French Foreign Legion officers carrying valuable intelligence through dangerous territory.

But as the Allies encounter one mishap after another, Violet becomes convinced there is a spy in their ranks. And when her commanding officer is murdered, Violet realizes she might be the only one who can uncover the traitor and save the lives of countless soldiers on the front lines. Convincing others to believe her is difficult enough. Finding someone she can trust just might be impossible.