"A different kind of story"
As someone who had seen the movie, I knew a bit of what to expect, but not how it would unfold in the original book. The narrator did a great job of conveying the emotion of each moment, and really drawing me in. Even though I knew (probably) what was going to happen, I never felt like it was just the same story I already knew. The first person narrative really makes it. It's a pretty quick read, but I didn't feel you were short changed for it - it was just the right length for the story.
At times it's an uncomfortable story - this is not a story for the faint of heart - but a very thought provoking one.