Shadow Grove isn't a typical town. Bad things happen here. Children disappear, one after the other, and nobody is doing anything about it. Parents don't grieve, missing posters don't line the streets, and the sheriff seems unconcerned.

Seventeen-year-old Rachel Cleary lives on the outskirts of Shadow Grove, next to the creepy forest everyone pretends doesn't exist. Usually the forest is filled with an eerie calm, an unmistakable graveyard solemnity. But the trees have started whispering, forgotten creatures are stirring, and the nights feel darker than ever.

Something is stalking the residents of Shadow Grove, changing them into brain-dead caricatures of themselves. It's up to Rachel to stop the devouring of her hometown before all is destroyed and everyone she loves is forever lost.

For a small New England town, Shadow Grove has an uncanny ability to attract the worst kind of trouble. Not that the residents are too concerned about the various horrors living among them.

As the leaves change color and the weather grows colder, a foul presence is making itself known by leaving peculiar gifts for the students of Ridge Crest High. At first the presents seem harmless—and a rash of accidents seem coincidental—but when seniors Rachel Cleary and her Scottish cousin, Dougal Mackay, find a boneless body in the boiler room, things take an ominous turn.

Something vicious is on the loose in Shadow Grove, and not knowing whether Orion Nebulius will ever return, Rachel has very little hope of anyone making it out alive.