During a battle with a foe from Imperium, elemental powers have mysteriously disappeared. The ninja set off to find out what is causing it, leaving Kai alone to watch the kids. What happens if Kai goes missing? Leaving the kids alone with the foe? What happens if Lloyd and the others get trapped inside Imperium with no way out? Find out more in the book! DISCLAIMER: I DO NOT OWN LEGO NINJAGO. ALL RIGHTS GO TO LEGO!