19-year-old witch, Ally Barrett, has spent years protecting the world from supernatural threats. But suddenly, her friends want to kill her and she can't remember why. Now, she's on the run, and trying to piece together what has happened over the past week.

Drawn to a small Pennsylvania town, she meets Evan, a young man tangled up in his own otherworldly problems. As Ally attempts to solve both of their mysteries, she grapples with vampires and demons, dodges assassins, and uncovers a plot to destroy the world.

Now it's a race to prevent an apocalypse - and it's possible Ally is the one behind it.