Charmfall (The Dark Elite, #3)

the long version

High school can be a battlefield, but for Lily Parker, surviving at St. Sophia’s School for Girls is a matter of life and death... Protecting Chicago from the dark side can be an exhausting job, especially when you’re a junior. So when the girls of St. Sophia’s start gearing up for Sneak, their fall formal, Lily decides to join in on some good, old-fashioned party prep—even if it means not giving demons, vampires and the twisted magic users known as Reapers her undivided attention. But when a Reaper infiltrates the school, Lily doesn’t forget what she’s sworn to protect. She reaches deep into herself to draw out her magic—and finds that it’s gone. And it turns out she’s not alone. A magical blackout has slammed through paranormal Chicago, and no one knows what—or who—caused it. But Lily knows getting back her magic is worth the risk of going behind enemy lines...