90: Witch & Wizard, by James Patterson with Gabrielle Charbonnet (2009 paperback)

The first book in one of Patterson's co-authored (one reason for his prolific production) TeenLit series, Witch & Wizard tells the story of a brother and sister dragged from their homes and imprisoned in the middle of the night by a newly "elected" totalitarian regime, which promptly charges and convicts them of witchcraft. While formerly unaware of their powers, the teens come into their own through a process of conflict and need for survival and join a group of runaway children set on (of course) saving the world. I wouldn't say it's the best of its type, and I prefer Patterson's Maximum Ride series (entries 87-89), but the straight-forward style and sense of humor will appeal to Tween and Teen boys and girls.