Oklahoma, 1909. Eleven-year-old Olive Augusta Radley knows that her stepfather doesn’t have good intentions toward the two Choctaw girls boarded in their home as wards. When the older girl disappears, Ollie flees to the woods, taking six-year-old Nessa with her. Together they begin a perilous journey to the remote Winding Stair Mountains, the notorious territory of outlaws, treasure hunters and desperate men. Oklahoma, 1990. Law enforcement ranger Valerie Boren-Odell arrives at newly minted Horsethief Trail National Park seeking a quiet place to balance a career and single parenthood. But no sooner has Valerie reported for duty than she’s faced with local controversy over the park’s opening, a teenage hiker gone missing from one of the trails, and the long-hidden burial site of three children unearthed in a cave.