Vienna, 1938. Samuel Adler is five years old when his father disappears during Kristallnacht - the night their family loses everything. As her child's safety seems ever-harder to guarantee, Samuel's mother secures a spot for him on the last Kindertransport train out of Nazi-occupied Austria to England. He boards alone, carrying nothing but a change of clothes and his violin. Arizona, 2019. Eight decades later, Anita Diaz and her mother board another train, fleeing looming danger in El Salvador and seeking refuge in the United States. But their arrival coincides with the new family separation policy, and seven-year-old Anita finds herself alone at a camp in Nogales. She escapes her tenuous reality through her trips to Azabahar, a magical world of the imagination. Meanwhile, Selena Duran, a young social worker, enlists the help of a successful lawyer in hopes of tracking down Anita's mother.