I've read the book and feel like this was a pretty faithful adaptation, if not a bit shallow in comparison. Obviously they can't keep everything from the book, but I feel like it didn't have quite as much emotional weight or depth and only scratches the surface of how Sloane was preparing to kill herself right before this all started. Also her relationship with Rhys wasn't really developed either. But again, I think they squeezed as much in as they could, though I personally would not have minded if they made the movie 20 mins longer. Overall, I enjoyed it and it's always great to see a book I loved as a teenager on screen!