The Kingdom Keepers have their hands full when, during the inaugural cruise of the Disney ship, Fantasy, to exotic locations, they discover that the Overtakers have infiltrated the cast, stolen a journal that belonged to Walt Disney himself, and plan to unleash a powerful evil, the Chernabog.

The Kingdom keepers and their friends discover that Maleficent and the Overtakers are plotting a catastrophic event that could have repercussions far beyond the world of Disney unless they solve a puzzle that is revealed during the Disney Cruise Line's inaugural passage through the Panama Canal.

Just when life for the five Kingdom Keepers is beginning to settle down, an intriguing video suddenly appears on Philby's computer at school. It's a call to action: it seems that the Overtakers, a group of Disney villains, are plotting to rescue their two captured leaders, who were hidden away by Disney Imagineers after a recent violent encounter at Disney's Hollywood Studios. A staged attack by some mysterious new Overtakers at DisneyQuest confirms...

Finn Whitman, an Orlando teen, is hired to be hologramed as a Disney World park "guide" but soon finds himself being transported into the Magic Kingdom in the dead of night to help fight a group of Disney villains, led by Maleficent, who want to take over Disney World--and maybe more.

When the evil Overtakers gain control of a computer server at the Magic Kingdom, allowing them to put the holographic hosts into permanent comas if they should fall asleep, Finn and the others race against time to find the missing Jez and foil the plan.