"When the town of Dimvale is overrun with two-headed mutant rats, Morton Clay knows that dark magic is to blame. And when his classmates get their hands on impossible gadgets like X-ray Specs and Antigravity Laser Cannons, he realizes the trouble is just beginning. Morton and his siblings, James and Melissa, are the only ones who can stop the chaos. But should they, if it means using forbidden magic themselves? As Morton delves deeper into Dimvale's mysteries, he begins to suspect they have no other choice."--Page  cover.