According to the book’s preface, the novel was written by brothers Rob and Andy Hedden
based on an idea from Rob’s son Ryan. The story was turned into
a movie
of the same name in 2002, and the book appear at roughly the same time. We’re listing
the book as a novelization of the movie (rather than the movie being an adaptation of the
novel) because that’s how it’s described on the book’s cover.
— Michael Main