Holy crap this was creepy. If you have anything to do with small kids, this book will make uncomfortable reading. The story is about a global outbreak of violence against adults, perpetrated by children. The children have no memory of the incidents once they're over, and they feel no remorse.
The protagonist is Hesketh Locke, an anthropologist with Asperger's. Locke's quirks and coping mechanisms make for an interesting character who you don't pity because he clearly doesn't see himself as disadvantaged by his different way of viewing the world.
It's well worth a look, but be warned that's this is not strictly a horror story - it's more of a cautionary tale than anything. Some people were disappointed by the ending and I can see why, but I enjoyed it.