The one with the author who gets into a car crash and his psycho biggest fan finds him and makes him re-write the book because he kills her favorite character? Sorry if it's not enough detail ^.^
Hehe, Crystal got it: Misery by Stephen King. Also one of the better movie adaptations, though I suppose that's not too hard to accomplish given the...lack-luster quality of the other King novel-to-movie stuff.
