In 1977 Buenos Aires, as Argentina's junta "disappears" thousands of civilians, a military death squad kills an author of children's books and abducts his pregnant wife, her sister, and the couple's infant daughter. Miriam Rosen will wage a decades-long struggle to learn the fate of her daughters and grandchildren. Her story is intertwined with the 2010 story of Kelly Martinez, a 32-year-old Philadelphia doctor. When her adoptive mother dies, Kelly receives an anonymous photograph of a woman labeled "Your Mother," which prompts her to initiate her own search for her birth family. On their converging paths to the truth, Miriam and Kelly will become entangled in a web of terror that threatens their lives and families and haunts its victims to this very day.