Between Two Ends by David Ward

Trying to help his father deal with his long-standing depression, Yeats and his parents visit his grandmother's old and eerie house, where he discovers a pair of pirate bookends that unlock a thirty-year-old secret that Yeats must try to resolve by entering the exotic world of "The Arabian Nights." If you liked Cornelia Funke's Inkheart, you'll love Between Two Ends. After you read it, check out a copy of Arabian Nights!
Summary from the MARINet catalog.

Artemis Fowl: The Atlantis Complex by Eoin Colfer

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Teenaged criminal mastermind Artemis Fowl must save the underwater fairy metropolis of Atlantis from danger, while battling a psychological affliction known as the Atlantis Complex. Check it out here, and be sure follow Artemis' adventures in the cool graphic novels available too. Summary from the MARINet catalog.

The Throne of Fire by Rick Riordan

That Rick Riordan is a busy writer! After you've read the 39 Clues, and of course all the Percy Jackson books, start the Kane Chronicles. Carter Kane and his sister must prevent the chaos snake Apophis from breaking free in a few days' time or the world will come to an end. To have any chance of battling these Forces of Chaos, the Kanes must revive the sun god Ra. Book 2 in the Kane Chronicles series. Summary from the MARINet catalog.