The Secret World of Ninjas presents the latest LEGO Ninjago figures and adventures with short, witty texts and over 250 illustrations of LEGO sets and images from the TV series. The book takes LEGO Ninjago fans on an adventurous journey to Ninjago and reveals the secrets of the brave ninjas Kai, Jay, Cole, and Zane. Young readers learn about the ninjas' extraordinary powers and discover everything about their cool vehicles and impressive battle gear. The wise Sensei Wu explains what makes a true ninja, and kids can take a test to find out if they have what it takes to be a ninja. Includes an exclusive LEGO Ninjago minifigure.