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.