In 1943, German SS officers in charge of Auschwitz-Birkenau ordered that an orchestra be formed among the female prisoners. Almost fifty women and girls from eleven nations were drafted into a band that would play marching music to other prisoners and was also made to give weekly concerts for Nazi officers. Being in the orchestra saved their lives – but at what cost? Award-winning historian Anne Sebba traces tangled questions of deep moral complexity with sensitivity and care.