After returning home from their latest adventure, Mallory, Jared, and Simon find Mulgarath, an ogre and leader the goblins, has taken captive their mother along with Uncle Arthur's field guide.
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After narrowly escaping the dwarven quarry, a battered and bruised Jared, Simon, and Mallory return home to find it has been ransacked by the evil Mulgarath, and that he's made off with Arthur Spiderwick's Field Guide to the Fantastical World Around You along with something far more precious to the Grace kids -- their mother. With the help of Thimbletack, Hogsqueal, and Byron, the Grace kids have to figure out how to rescue Arthur Spiderwick from the domain of elves so that he can help them stop Mulgarath and defeat his goblin army before it's too late.
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