It was the last summer night at Amble Park for the Campfire Club--an outcast group of pre-teens fueled by s'mores and ghost stories--when Marcy discovered the perfectly intact skull of a whitetail buck. It was the same night that she saw Him, a formidable, antlered form that watched her from the windows of an abandoned building in the trees. Since that night, Marcy has been running from that unknowable darkness, traumatized by night terrors, panic attacks, and gruesome hallucinations.

Now, in the care of St. Peter's Center for Mental Health, she's been out of its reach for years, but she's no closer to knowing what that horror was or why it chose her.

When her childhood friend Josh comes to visit, he shows her letters and drawings from their mutual friend Kevin that suggest Marcy's hallucinations aren't hers alone. Kevin appears to be meddling with the occult, and his wife is nowhere to be found. Now Josh wants to bring the Campfire Club back together for Kevin's sake, but with every grim discovery, the seams of their reality begin to come undone.

Marcy must once again confront her fears to end the nightmare whose roots run deeper and wider than they could have ever known.