Danny and his schoolmates have been sent to Norrisville High School until further notice. Although surviving his surroundings with new friends and foes isn't hard, Danny accidentally loses a sacred book that belongs to the town's Ninja, starting events that'll bring back his worst nightmares. Now he and the Ninja most work together to stop the oncoming storm of horror.

A ghost hybrid, a psychic detective, a ghost hunter's conference in Santa Barbara, and a teensy little murder investigation with Danny as the suspect. What can possibly go wrong?

As a general rule, diving into unknown swirly vortexes in the Ghost Zone is a bad idea, but this was a time when Danny had no other real choice. Meanwhile, Jake thought he was through dealing with ghosts, but Rotwood, well, he's just getting started.