Looking for a fresh start, Helen Grace and her three kids leave New York City and move into the old, abandoned Spiderwick Estate that great uncle, Arthur Spiderwick, has left her. One day nine-year-old Jared discovers Arthur Spiderwick's Field Guide to the Fantastical World Around You in the upstairs attic, and his life changes forever. Despite the numerous warnings, Jared reads the book, and now he must keep the field guide out of harm's way, or else suffer the consequences. With a house brownie named Thimbletack to help him along, Jared, his twin brother, Simon, and their sister, Mallory, take on a world of fantastical creatures!