Cara Moone is a wizard—but she’s basically flunked out of wizard school. Now she’s in training to be a MOP, also known as Magical Occurrence Purger, also known as it’s Cara’s job to sweep up the hazardous dust a wizard’s spells leave behind. A real wizard, that is, like Harlee Wu, the so-called Chosen One destined to save the magical world. But when one of Harlee’s spells goes awry and leaves behind a rift in the fabric of magic itself, it'll take more than magic to clean up the mess. Luckily, messes are kind of Cara’s thing.