Nightschool / Chmakova, Svetlana

"Schools may lock up for the night, but class is in session for an entirely different set of students. In the Nightschool, vampires, werewolves, and weirns (a particular breed of witch) learn the fundamentals of everything from calculus to spell casting. Alex is a young weirn who has always been homeschooled, but when her sister, Sarah, vanishes and all memory and evidence of her existence is erased, Alex is determined to get to the bottom of it. What better place to start her investigation than the Nightschool where Sarah used to work? But when Alex discovers that sneaking into the Nightschool isn't as simple as it seems, she enrolls as a student. It she prepared for what she might find?"--Back cover.

"Betrayed by one of their own, the Hunters have become the hunted as their hideaway is invaded by a pack of ravenous werewolves! But it'll take more than a few mongrels to get the better of these kids. Meanwhile, Alex begins advanced training with Mr. Roi. Will he be able to help her find a clue to her sister's disappearance? Or is the homeschooled Alex in way over her head? With the Sohrem rising, the Hunters on the move, and Alex caught in the middle, the shadow of the enemy who has been pulling all the strings begins to show. But is it the enemy without--or the one within her--that Alex should fear the most!?"--Back cover.

Alex finds herself caught in the middle with the Sohrem rising and the hunters on the move, but she worries that her real enemy may be the one inside her.