Nightschool: The Weirn Books: Volume 3

by Svetlana Chmakova, 212 pages

At school, Alex discovers she's not the only one to remember her sister; nor is her sister the first to have disappeared. She teams up with the student council and a geeky T.A. in order to retrace the steps of the missing.

Elsewhere, the hunters' safe house is betrayed by one of their own and comes under attack by an underworld werewolf gang. But what or who is the real target? And how is this all connected to Alex?

Daemon, the hunters' capable leader, and Mr. Roi, the most powerful, colorful, and insurance-claim-generating teacher at the nightschool, combine their resources to track down the source of the emerging threat and try to find a way to stop it.

There are more subplots here than I know how to explain, so you'll just have to read it (preferably one volume right after another so you don't forget who's who and what's going on).