The Spiderwick Field Guide is a fictional book that serves as a comprehensive guide to the magical creatures and phenomena found in the world of Spiderwick Chronicles. Created by authors Tony DiTerlizzi and Holly Black, the guide features detailed illustrations and descriptions of various mythical beings, such as fairies, goblins, and sprites. It aims to educate readers about the hidden wonders and dangers of the enchanted realm. This guide is presented as a resource for characters in the series, particularly the Grace children, who discover the magical world after moving to the Spiderwick Estate. The book emphasizes the importance of observation and caution when interacting with these creatures, making it a key element in the overarching narrative of the Spiderwick Chronicles.