The Ultimate Guide is a handbook written by Mary-Jane Knight that’s based on the Percy Jackson And The Olympians series by Rick Riordan.
This book was released on January 18, 2010.
The Ultimate Guide book description
It’s the handbook no half-blood should be without: a fully illustrated, in-depth guide to gods, monsters, and all things Percy.
This novelty companion to the best-selling series comes complete with trading cards, full-color diagrams, and maps, all packaged in a handy, “manual-size” POB with a crisp, magnetic flap enclosure.