School Spirits by Rachel Hawkins 

Fifteen-year-old Izzy Brannick was trained to fight monsters. For centuries, her family has hunted magical creatures. But when Izzy’s older sister vanishes without a trace while on a job, Izzy’s mom decides they need to take a break.

Izzy and her mom move to a new town, but they soon discover it’s not as normal as it appears. A series of hauntings has been plaguing the local high school, and Izzy is determined to prove her worth and… Read more.