Sarah Keller is a single mother to five-year-old Zoe, living quietly in Oklahoma. When a school bus accident sends Zoe to the ER, their quiet life explodes. Zoe's medical tests reveal what Sarah has been hiding: Zoe is not her daughter. Zoe's biological mother-- Sarah's sister, Beth-- was murdered shortly after the child's birth. And Zoe's father is missing and presumed dead. With no way to prove her innocence, Sarah must abandon her carefully constructed life and go on the run. Chased by cops, federal agents, and the group responsible for Beth's murder, Sarah embarks on a desperate journey.