Berlin, 1989. As the wall between East and West falls, Miriam Winter cares for her dying father, Henryk. When he cries out for someone named Frieda—and Miriam discovers an Auschwitz tattoo hidden under his watch strap—Henryk’s secret history begins to unravel. Searching for more clues of her father’s past, Miriam finds an inmate uniform from the Ravensbrück women’s camp concealed among her mother’s things. Within its seams are dozens of letters to Henryk written by Frieda. The letters reveal the disturbing truth about the ‘Rabbit Girls’, young women experimented on at the camp. And amid their tales of sacrifice and endurance, Miriam pieces together a love story that has been hidden away in Henryk’s heart for almost fifty years.