Sheila Kelley, a seasoned through-hiker, embarks on the grueling Continental Divide Trail, expecting the usual trials of wilderness and solitude. But deep in Montana’s Bob Marshall Wilderness, she stumbles onto a dark secret—something far more dangerous than the terrain itself. Haunted and hunted, Sheila fights to survive an encounter with a mysterious predator that stalks the shadows. This is a story of endurance, terror, and the thin line between life and death on one of America’s most challenging trails.