Northcroft is an elite boarding school with a deadly secret. Each night as the bell tolls and the shutters slam down, cutting off the outside world, the Afterdark descends, turning the surrounding old growth forest into a macabre copy of itself. A negative photograph crawling with horrors.

Evie Laurent is certain of one thing from the moment she sees Holland Morgan on the front steps of Northcroft: she wants to know everything there is to know about her. But there are some things about Evie herself that are better kept secret. Especially the fact that she let her sister drown. And that it's getting harder to ignore her dark impulses . . .

Holland Morgan knows falling for Evie is just one more terrible choice in her long history of terrible choices. The problem is, she's not sure she cares.

As attraction turns slowly to obsession, they find themselves playing a dangerous game. Something out there is calling to each of them. Beckoning to the shadows within.

Do they fight the call and protect one another, or answer and embrace the darkness?