When mysterious footprints appear in the Stockholm snow, ten-year-old Kara attempts to discover where they’ve come from and who they belong to. They lead Kara to Rebecca, a thirteen-year-old Jewish girl, and her younger brother Samuel.     Before long Kara realizes Rebecca and Samuel are refugees from another time—World War II—who are trying to find their way home. Kara discovers that her friends are trapped in a time loop, and they must make it to the British plane that lands near their hideout in order to make it out alive. With unexpected help, Kara travels into the time split to help save her friends.