Obsession is deadly.

No one learns that better than Luna Ketz, a pessimistic high school senior. Caught between her parents' intentions for her life and her own plans, boys are the last thing on Luna's mind. This fact doesn't detour the mysterious Chance Welfrey from trying to gain her affection.

Luna doesn't think twice about him until girls at their high school begin to disappear. Girls who tended to hurt her. Girls she wished would disappear.

When she receives a call from a long-lost friend, normalcy goes out the window as she's plunged into the paranormal. There's a world beneath the surface of the unconscious mind, and a murderer who knows how to navigate it.

Luna is in danger and although she can avoid the killer in reality, she cannot avoid him in her dreams.