When police discovered the body of Eileen Nearne at her home in September 2010, they also found a box of possessions that unlocked an extraordinary tale of hidden wartime heroism. For Eileen and her sister Jaqueline were agents for the Special Operations Executive during the Second World War, working undercover in Nazi-occupied France to send crucial intelligence to the Allies. But the war dealt these sisters a cruel hand. While Jaqueline narrowly evaded capture, Eileen was arrested and tortured by the Gestapo before being incarcerated in Ravensbruck concentration camp. She was only 23. Now, for the first time, the truth about these fiercely patriotic women is told in full, their unwavering courage at great personal cost paid tribute to at last.