Set in 1943, this historical thriller centers on the fierce friendship between two young British women during World War II: Maddie, a civilian pilot, and Julie, a secret agent. When their spy plane crashes in Nazi-occupied France, Julie is captured by the Gestapo. Interrogated under brutal conditions, she is given a choice: reveal her mission codes or face execution. Julie agrees to write her confession on whatever scraps of paper she can find. However, her confession becomes a masterfully woven story detailing her deep friendship with Maddie and how they joined the war effort. The book is split into two points of view, revealing a complex mind game of espionage, secrets, and ultimate sacrifice.