The "Spiderwick Chronicles" is a children's fantasy book series written by Tony DiTerlizzi and Holly Black. It follows the adventures of the Grace children—Jared, Simon, and Mallory—who discover a hidden world of magical creatures after moving into the old Spiderwick Estate. They find a mysterious field guide that reveals the secrets of the fantastical beings around them. As the siblings explore this enchanting world, they encounter various creatures, including fairies, goblins, and ogres. The series emphasizes themes of family, bravery, and the importance of understanding the unknown. It has also been adapted into a movie and a television series.