Using cutting-edge technology called DHI (Disney Host Interactive), the Disney Imagineers capture the images and voices of Finn Whitman, a young Orlando teen, along with four other kids, then transform them into hologram projections that guide guests through the park. The new technology turns out, however, to have unexpected effects that are thrilling and scary when Finn finds himself transported into his DHI form at night. Is it a dream or reality?...

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.

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.

When five present-day teenagers known as the Kingdom Keepers travel back to 1955 for Disneyland's Opening Day, the early days of the Tower of Terror, the origin of the Overtakers, and the real power of magic unfold in an unexpected series of events that propels the Keepers into a darkness no one saw coming.