Special Topics in Calamity Physics, Marisha Pessl.
It's a little too self-consciously clever, although it gets better about that as the book goes on. Also, it is rather reminiscent of The Secret History, at least at the start. The real problem is the pacing. First 3/4 is quite slow, then the whole thing winds up with a bang in about a hundred pages. I'm sure that this was intentional and meant to make a point about the relative importance of the two sections of the book, but it didn't work that well. The effect was that the 'mystery' was wound up improbably quickly and it felt unbalanced. After you finish, of course, you realise that there were clues towards the beginning that you missed but it doesn't entirely mitigate the effect.