Can a person really disappear for good by going off the grid? And what happens when vanishing is no longer an option? Sarah Keller is a single mother to five-year-old Zoe, living quietly in Oklahoma, She's also a skip tracer, an expert in tracking people who've gone on the lam to avoid arrest, prosecution, or debt - pinpointing their location to bring them to justice. 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 muredered shorltly 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.