Shelby Black's great-uncle Roy -- a Catholic priest -- has put her through exorcist boot camp hell, hoping to develop her talent. High school is hard enough without having to explain that you fight demons for a living, so Shelby keeps her extracurricular activity to herself. The last thing she wants is for her crush, Spencer, to find out what she does in her off time. Shelby is also hellbent on finding her missing mom, no matter if it ends up costing her is her soul-- and a relationship with Spencer.