The Awakening - Kelley Armstrong

You don't have to be alive to be awakened.

Chloe Saunders is a living science experiment--not only can she see ghosts, but she was genetically altered by a sinister organization called the Edison Group. She's a teenage necromancer whose powers are out of control, which means she can raise the dead without even trying. Now Chloe's running for her life with three of her supernatural friends--a charming sorcerer, a cynical werewolf, and a disgruntled witch--and they have to find someone who can help them before the Edison Group catches them.

Or die trying.