Arthur Spiderwick's Field Guide to the Fantastical World Around You, also known simply as Arthur Spiderwick's Field Guide, the Field Guide, or the Guide, is the book written by Arthur Spiderwick about the Invisible World. The Faerie people were worried about the Field Guide, as it contained information on all their weaknesses, which, if published, could mean the extinction of the already endangered Fey. Therefore, the Elves wanted to destroy the book, but when Arthur didn't give them the Guide, they imprisoned him in their kingdom for almost 80 years, but he didn't age a day.