Can books have "trailers"--like movies? Guess so--in fact, one of my earliest professional illustration jobs was creating a storyboard for a commercial to announce John Irving's then-upcoming
A Prayer For Owen Meany (for which I had to draw an anatomically-correct
armadillo from memory...).
Stephen King's new novel
Duma Key is due in just two weeks and his official site has a snazzy grabber of a trailer that should give you some idea of what you're in for should you choose to indulge, and really...why wouldn't you?