In this "gripping fantasy adventure" (The Wishing Shelf Book Awards), Casey Grimes begins his studies at Trickery School, one of America's premier monster-control academies. But classes like Extreme Climbing and Land Creature Defense are the least of his worries. He realizes a mysterious enemy is after him-more cunning than a Bog Creep or Hyena Toad. And this secret adversary is playing for keeps.

Twelve-year-old Casey Grimes almost died fighting the Butcher Beasts. On the bright side, he's no longer invisible. Even better, he's enrolled at Trickery School in the heart of Sylvan Woods-a secret forest society in charge of keeping monsters out of the suburbs.

The campus is gorgeous, the classes are crazy, and Casey and his little sister Gloria have good friends: Luci and Robert and Jake. But Casey quickly realizes he has bigger problems than surviving Land Creature Defense and Extreme Climbing.

Magic is causing controversy at Trickery. It's back on the curriculum after a hundred years and everyone knows Casey is responsible. Even worse, someone is out to get him, someone more cunning than a Bog Creep or Hyena Toad.

As the shadow enemy closes in, Casey races to discover why he's being targeted. Solving the deadly mystery will take all the courage and tenacity he's got.