"The Spiderwick Chronicles" is a children's fantasy book series written by Tony DiTerlizzi and Holly Black. The story follows the Grace family, particularly siblings Jared, Simon, and Mallory, who discover a hidden world of magical creatures after moving into the old Spiderwick Estate. As they explore this enchanting realm, they encounter various fantastical beings, including fairies, goblins, and ogres. The siblings must protect a valuable book, the Field Guide to the Fantastical World Around You, which reveals secrets about these creatures and their world, while facing challenges and dangers that arise from their newfound knowledge.