Ancient ruins. Haunted memories. A ruthless predator. Can Maggie survive the ghosts of her past - and the monster hiding in plain sight?

When she returns to her job as a National Park Ranger at "The Castle"—an ancient Native American pueblo carved into an Arizona cliff—Maggie hopes the comfort of familiar ground will help her heal. Battling trauma and the grief of unimaginable loss, Maggie’s days are carefully measured, her life held together by the thinnest of threads.

But strange things are happening at the park. A mysterious child appears and vanishes without a trace. And a predator watches her every move, planning his attack.

With the help of friends, fellow survivors, and the land itself, Maggie begins to reclaim her strength. But the danger is closer than she knows, and soon Maggie will have to face a deadly threat... and her deepest fears.