The Secret History AND Me Before You.
Based on people raving about them on here. I've already picked up Margaret Attwood (and loved them), downloaded The Luminaries onto my Kindle and found a Maggie O'Farrell and two Sarah Waters in charity shops. All recommended on this board. I generally read fantasy fiction so I'm trying to read different stuff having recently finished an epic 14-book series and needing a break.
So if the two I got yesterday aren't great now I'll be back to exact vengeance on this board!