The Mysterious Benedict Society by Trenton Lee Stewart

"I think the question is why you were running instead of walking."
"Why not?  It's faster."
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This is an excellent, fast-moving story about never underestimating clever children.  The adventure book is entertaining and enjoyable on every page.  I laughed at the children, wracked my brain to solve the mysteries with them, and related to their struggles.  I highly recommend this one!