But these moments are primarily limited to the film's initial half-hour, and after that, the picture sinks into an exciting, groovy rush and even begins to recall the old-time Saturday matinee serials as Raiders of the Lost Ark did. Taken for what it is, and approached sans expectation, Book of Secrets should please many undemanding viewers, especially teenage and preteen males, with its roller coaster-like ride of thrills. It's surprisingly fun. ~ Nathan Southern, All Movie Guidehttp://www.imdb.com/title/tt0465234/