Overnight, by Adele Griffin

Caitlin's birthday sleepover is the high social event of the year for the Lucky Seven -- the in-crowd at school. But when one of them gets abducted, the whole thing falls apart. By the end of the evening, the old alliances will be permanently broken.

Told from several viewpoints, Griffin captures the pettiness of sixth-graders well. Whether this makes for a good read is a matter of debate. If I was a sixth grader, I'd probably take offense at how shallow and cruel everyone is portrayed. But most of all, too many things were left unanswered, and that's frustrating. I like a few loose ends, but an awaful lot at the end is left unanswered.