The sole survivor of a plane crash, 72-year-old Cloris Waldrip finds herself lost and alone in the unforgiving wilderness of Montana's rugged Bitterroot Range, exposed to the elements with no tools beyond her wits and ingenuity. Intertwined with her narrative is the story of Debra Lewis, a park ranger struggling with addiction and a recent divorce who is galvanized by her mission to find and rescue Cloris. As Cloris wanders mountain forests and valleys, subsisting on whatever she can find, her hold on life ever more precarious, Ranger Lewis and her motley group of oddball rescuers follow the trail of clues she's left behind. Days stretch into weeks, and hope begins to fade. But with nearly everyone else giving up, Ranger Lewis stays true until the end.