The Mysterious Benedict Society by Trenton Lee Stewart
What a great new children's novel this is (grades 5-9, says the publisher). It's a grand adventure story of four extraordinary children brought together by the mysterious Mr. Benedict to save the world from impending doom. Each of the children has different strengths -- Reynie is a hardworking puzzle solver, Kate is strong and acrobatic, Sticky remembers everything he reads, and Constance Contraire is... contrary. But mixed in are some fairly serious explorations of the notion of family, of how far you can go fighting evil without compromising your ideals, of bravery.
A great review by Jessie at What We're Reading Now.
(Disclosureville: Trenton Lee Stewart is my co-worker Kenner's brother-in-law Trent.)