Zach Lopez has just moved to Devils' Pass and is missing California already. When he meets Tiffany, Jeff, and Evie in his new school, they tell him the town isn't what it seems and that strange things happen there. Zach isn't buying it—until he sees a glimpse of a white horse with a horn and a mane full of glitter. Could it really be a unicorn? Soon, Zach finds that his new friends were telling him the truth—and more. They have to save the town from a brutal infestation of carnivorous unicorns before the whole town gets eaten.