There are 7 books in the Kingdom Keepers series. The newest book is The Insider which came out in 2014.

Five young teens tapped as models for theme park “guides” (using a new hologram technology developed by the Disney Imagineers) find themselves pitted against Disney villains and witches that threaten both the future of Walt Disney World and the stability of the world outside its walls. Featuring a new cover…
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2
Disney at Dawn

Book cover of Disney at Dawn
It's supposed to be a happy day at the Magic Kingdom—the return of the teenaged holographic hosts. But things go very wrong when a sudden lightning storm disrupts the celebration, and Amanda's mysterious sister, Jez, disappears. The only clue is the sighting of a wild monkey in the Magic Kingdom…

3
Disney in Shadow

Book cover of Disney in Shadow
When Disney Imagineers installed hologram guides for the Magic Kingdom using teenage models, they had no idea the technology might backfire. But backfire it did: some nights when the kids go to sleep, they wake up in one of the Disney parks as a hologram.
     With the adventures in the…

4
Power Play

Book cover of Power Play
For the five teens who modeled as Disney Hologram Imaging hosts, life is beginning to settle down when an intriguing video arrives to Philby's computer at school. It's a call for action: the Overtakers, a group of Disney villains, seem to be plotting to attempt a rescue of two of…

5
Shell Game

Book cover of Shell Game
As the five Kingdom Keepers enter high school, everything is about to change. The Maintenance Base that controls all four parks in Disney World is under attack by the Overtakers, a group determined to change Disneyforever. Relationships between the Keepers are no longer as simple as they once were. In…

6
Dark Passage

Book cover of Dark Passage
The five Kingdom Keepers and their core friends have uncovered a startling truth: Maleficent and the Overtakers (Disney villains) are plotting a catastrophic event that could have repercussions far beyond the world of Disney.

Aboard the Disney Cruise Line’s inaugural passage through the new Panama Canal, the Keepers and their…

7
The Insider

Book cover of The Insider
The Kingdom Keepers’ senior year in high school is almost over. For more than three years, things have been quiet. Their battles are long behind them, they agree, the threat to the Disney realm silenced–albeit at great cost. But inside the catacombs of the Aztec temple where Finn Whitman faced…