Penumbra: Equinox — J. Rose Alexander

What would you do to keep your friends from falling into evil? It wasn't a question the group of friends at Ulysses Grant Regional High School wanted to think about. With Vincent trying to hide his werewolf side, Alia and Coray having to deal with the unanticipated news that they are witches, and Coleen getting slammed with the news she's adopted, they have enough to worry about. (Never mind Vincent's and Alia's crazy exes, Coray's mother, Coleen's father and the magical creatures someone is sending after them to kill them. There was enough to keep anyone busy right through prom.) But the day Vladimir Vaduva shows up at their school and people start turning up both dead and drained of blood, and Coleen very nearly goes mad because of him, it becomes a question they have to have ask. As Rosa and Billy get pulled into the vortex, they realize they need an answer... And they have the feeling they aren't going to like it.