Just finished Anthony Horowitz's Raven's Gate, the first in the Gatekeepers series. It's easy to see why his books are popular with middle-schoolers. The main characters are easy to relate to, there's plenty of action, just a bit of horror, and he doesn't bog down in long descriptive passages. This one has 14-year-old Matt, an orphan who's life has gone steadily downhill since the deaths of his parents, being sent to a remote village as part of an alternative juvenile offender program after being involved in a stabbing during a botched robbery. Once there things get weirder and creepier and anyone who seems to be trying to help Matt is dying under mysterious circumstances. Then the action really starts to pick up. Another good series choice for middle-schoolers. I recommend it.