Instead of focusing on Artemis, the evil criminal mastermind at war with the fairy realm in the seven book series, this guide book is meant to be a translation and interpretation of the fairy tome, The Book of the People, and there a number of side notes from Holly Short, one of the main fairy characters, littering the pages.
There are several catalogs in the book that are very helpful, especially if its been a while since one has read the series. There are descriptions, with very nice drawings, of the different creatures that people the fairy realm, similar entries of the main characters in the books, complete with their characteristics and main accomplishments, and a really fun section detailing all of the gadgets and buildings used in the books. The pencil drawings by Andre Pelaes and Carlos Tron really bring the characters and settings to life.
In addition to these descriptions, there are some illustrative stories offered by way of illuminating certain parts of the manual. We hear from Jeffrey Wigglebottom, who was seen by Mud People, Pidge Plank, who tells a cautionary tale of trying to enter a human dwelling without permission, and an incident report from Officer Root about why its important to fully understand one's equipment. These are fun auxiliary tales to get back into the swing of the series, if it hasn't been read in a while.