Novelizations
Disney Press published an official novelization of the screenplay titled National Treasure 2: Book of Secrets The Junior Novel on November 6, 2007. Parts of the story in the novel version differ slightly from what was actually filmed, owing to changes being made in the screenplay prior to and during production. For example, in the novel, Ben and Abigail photograph the wooden plank found hidden in the Queen's desk and leave it behind, with the car chase following. But in the movie, they take the plank with them on the chase.
Also published on the same day as the official novelization was a companion youth novel Changing Tides: A Gates Family Mystery by Catherine Hapka. Its story is set in England in the year 1612 and is the first in a series of planned historical novels about the Gates family. The epilogue from Changing Tides is included at the back of the National Treasure book. The second youth novel by Hapka, Midnight Ride: A Gates Family Mystery, was published on March 8, 2008.
Read more about this topic: National Treasure: Book Of Secrets