"The world of LEGO NINJAGO is changing, and Master Wu, Kai, and the other Spinjitzu Masters must face an all-new challenge unlike any they have ever faced before...or have they? Will a forgotten adventure from their past give them the clues they need to face the future? Find out in this action-packed chapter book series that is illustrated throughout and features four all-new adventures of LEGO mighty Masters of Spinjitzu!"--