A young girl learns of her grandmother and great-aunt's involvement in the Dutch Resistance during World War II in this "intense story, gorgeously told" (School Library Journal, starred review) of family, history, resilience, and hope from acclaimed author Liz Kessler.

Thirteen-year-old Liv's beloved ninety-two-year-old grandmother, Bubbe, is moving into a home where she can be cared for as her dementia worsens. As Liv helps her father empty Bubbe's house, she finds an old chest which opens up a whole world that Liv never knew about: the hidden world of Bubbe's childhood.

Through the letters and other mementos, Liv learns that her bubbe, given name Mila, had a sister, Hannie, that no one in Liv's family ever knew about. In 1942, Mila and Hannie are sent away from their parents to a non-Jewish family so they will survive the war. Twelve-year-old Mila believes that they will soon be reunited with their parents and go back to their normal lives, but fourteen-year-old Hannie knows better, and soon gets involved in the Resistance. Hannie takes on more and more dangerous assignments until a betrayal forces her to decide between running away with her sister or fully committing to mission. Tragedy strikes, and Mila goes to England on her own to restart her life from scratch, vowing never to talk about her childhood again.

In the present day, Liv reads how Mila builds something new from the shattered pieces of her childhood while giving beloved Bubbe all the support she can. Both Liv and Mila grapple with loyalty, family, and love as they discover what it means to be brave and go above and beyond to offer someone else a life of dignity, happiness, and freedom.