Eileen Nearne and her sister Jacqueline 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 Jacqueline 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...