The Kingdom Keepers is a series of novel

Novel

A novel is a book of long narrative in literary prose. The genre has historical roots both in the fields of the medieval and early modern romance and in the tradition of the novella. The latter supplied the present generic term in the late 18th century....

s for young readers, written by Ridley Pearson

Ridley Pearson

Ridley Pearson, born on March 13, 1953 in Glen Cove, New York, is an American writer. Pearson has historically written suspense and thriller novels for an adult audience, but has also begun branching out by writing adventure books for children....

 and published by Disney Hyperion. The first novel, Disney After Dark, was published in 2006, and the second, Disney at Dawn, was released on August 26, 2008, and the third, Disney In Shadow was released on April 6, 2010. According to Pearson's blog, The Kingdom Keepers was submitted to Walt Disney Pictures

Walt Disney Pictures

Walt Disney Pictures is an American film studio owned by The Walt Disney Company. Walt Disney Pictures and Television, a subsidiary of the Walt Disney Studios and the main production company for live-action feature films within the Walt Disney Motion Pictures Group, based at the Walt Disney...

 for a film in August 2006 and was resubmitted again around July 2008.