Sixteen-year-old Shelby Black has spent the past year training to be an exorcist. Her great-uncle Roy - a Catholic priest and Shelby's guardian - believes she has a gift for expelling demons, and he's put her through exorcist boot camp hell, but he still doesn't trust her to do an exorcism on her own.High school is hard enough without having to explain that you fight demons for a living, so Shelby keeps her extracurricular activity quiet, especially from Spencer, her cute math tutor. Secrets run in Shelby's family, though: her mother has been missing ever since an exorcism went horribly wrong, and Uncle Roy is tight-lipped about it. But Shelby's hell-bent on finding her mom, no matter what - even if what it ends up costing her her soul AND a date with Spencer.