Thimbletack, the house brownie of Spiderwick Mansion, has made it his mission to protect the Field Guide at all costs, but when a new family moves into the mansion and Jared Grace takes the book, Thimbletack decides that it is time to take action.
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Thimbletack is angry. His quiet home has been turned upside down, invaded by several noisy, troublesome creatures - a family, in fact, known as the Graces. The one who's causing the most trouble is a boy named Jared. And when Jared takes the book that Thimbletack has spent his whole life guarding, the house brownie decides that it's time to take action.
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