This unforgettable novel from USA Today-bestseller Rachel Wesson is based on the incredible true story of two unsung heroines who risked everything to save countless lives in the lead-up to WW2. Connie Fitzwalter never imagined that her passion for music would lead her into a world of danger and intrigue. When her old family friend Stephen, who works for the foreign office, tells her the true scale of the violence in Germany and Austria, she can stand aside no longer. Together they devise a daring and perilous mission to help innocent people escape the clutches of Nazi persecution. Under their cover as music enthusiasts travelling to high-society concerts in Europe, Connie and her sister Dottie begin helping desperate families escape to safety into England. As the sisters travel into the heart of Nazi Germany, defying the border guards, patrols and Gestapo agents takes every ounce of courage they have. One misstep, one whisper of suspicion, and they could lose everything—their freedom, their futures, and even each other.