I first heard about it in Michael Lewis' Vanity Fair profile on Obama (Obama was reading it - http://www.vanityfair.com/politics/2012/10/michael-lewis-pro...), and then my cofounder Omar mentioned it as an engrossing book whilst he was reading it, specifically because of the topic it handles: the malleability of our memories.
Anyway, it was a pleasure to read, captivating, and the imagery jumping out of the pages was brilliant. I frequently had to stop and re-read parts. It also made me laugh.
A personal favourite sentence:
"History is that certainty produced at the point where the imperfections of memory meet the inadequacies of documentation."
It won the Man Booker prize last year.
On the non-fiction side, probably "Thinking, Fast and Slow" by Kahneman, though I haven't quite finished it. It's dense, but filled with insight after insight.