This is book number 3 in the Kingdom Keepers series.
The Kingdom Keepers' third adventure
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 holograms.
The five teens have twice thwarted evil plots masterminded by Maleficent; but now Finn, Philby, Willa, Charlene, and Maybeck have another problem: Wayne, their mentor and head Imagineer, has mysteriously gone missing. Concerned that Wayne has been abducted by the Overtakers, the kids pick up a major clue from a close friend, Jess, whose dreams (nightmares, really) often accurately predict the future.
This time, the clues from Jess's dream lead the kids into Disney's Hollywood Studios and Epcot. Each clue seems tied to the last, and with the stakes growing ever higher, what starts out as a puzzle ends up as a fight for their lives. As they quest for a sword, take rides on Soarin' and Maelstrom, have life-and-death encounters with a giant snake, and attempt to stop Maleficent, the Kingdom Keepers not only begin to decipher deeper meanings in the clues, but discover new truths about themselves and their ever-growing friendships.