Strange is Her Life: An Urban Fantasy Action Adventure: The School of Necessary Magic, Book 6 / Judith Berens, Martha Carr, Michael Anderle

Dark magic has infiltrated the school of necessary magic. 

Spies stalk the halls. Traitors whisper lies to impressionable freshmen.

And devious wizards distract with charming smiles.

If Alison and her friends can't see past the friendly masks of their fellow students to the dark purpose they hide, it's not just the school that will be destroyed.

But the forces of evil should have kept one thing in mind before targeting Alison Brownstone.

Hell hath no fury like a drow princess defending her family.