Seconding quite a few of the suggestions already made here...
Percy Jackson & The Heroes of Olympus - Rick Riordan (I personally didn't care for the Kane Chronicles, but it's worth a try)
Artemis Fowl - Eoin Colfer
The City of Ember & sequels - Jeanne DuPrau
Skulduggery Pleasant - Derek Landy
The Underland Chronicles (starting with Gregor the Overlander) - Suzanne Collins
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