First 200 pages were three star. Then almost hit the heights of five star around the 400 page mark - and kept me up till midnight on a school night - then the ending let the whole book down. 
 The beginning third needs editing, I feel. The writing is flat, dull and in some places just plain bad (since when was 'jealousify' a word..?). It does pick up, although I struggled with the motivations of one of the leads (if you've read it hopefully you'll know what I mean), and for me did not deliver the 'bang' it promised. But a good read, and I am looking forward to the movie and the inevitable Chin of Affleck.