Follows the Grace family as they move from Brooklyn, New York, to their ancestral home in Henson, Michigan, the Spiderwick Estate.

It follows the Grace family as they move from Brooklyn, New York, to their ancestral home in Henson, Michigan, the Spiderwick Estate. Helen makes the move with her 15-year-old fraternal twin boys, Jared and Simon, and her older daughter, Mallory. Shortly after moving to the Spiderwick Estate Jared discovers a boggart and realizes that magical creatures are real. The only one to believe him is his great-aunt Lucinda who implores Jared to find the pages of her father's field guide to magical creatures and protect them from the murderous Ogre, Mulgarath.