I guess that if I hadn't had so high expectations of this I would be giving it 4 stars. 
 Fact is... It is thrilling and holds your attention throughout, being both technically and stylistically very very well written. But... for such dramatic characters, they were sort of unfeeling, weren't they? They could be narcissists and still be more empathic, couldn't they? Plus, we jump so quickly to when things start to go wrong(view spoiler)[ I mean, when Richard starts behaving like an asshole (hide spoiler)], that it's difficult to grasp why they would all be friends to begin with. I had a hard time buying all of their relationships(view spoiler)[ (luckily, the only one I bought was the one I was really supposed to! I did worry for a bit that James/Oliver was gonna remain subtext, this is how naive I was) (hide spoiler)], characters disappeared for bits of the story(view spoiler)[ (hello, Wren? Alexander? Filippa?) (hide spoiler)] and felt the author confused sex appeal with chemistry(view spoiler)[ (it is not the same! Meredith is sexy and beautiful,and yet it would still be believable that she hasn't got chemistry with everybody! I'm not quite content at how her character is portrayed) (hide spoiler)]. Plus, the text made you believe the problem was that they all felt, as human beings, that they were being typecast into already-established characters/personalities... But no, the problems start precisely when they are not typecast(view spoiler)[ I mean, obviously, Richard starts to unravel because of this, but what about the rest? (hide spoiler)]... Andddd lastly, (view spoiler)[Oliver: cannot believe he's being constantly referred to as the "nice" one, seeing how he treats his sisters (yikes!) (hide spoiler)], in general, I thought the author took some very serious topics (view spoiler)[(eating disorders, drug overdose) (hide spoiler)] too lightly, when they weren't even essential to the book and could have easily been removed. 
 I might be being too harsh: I did enjoy it and I did read it very quickly, might come back later and change the rating/review.