I haven't read as many books as some people maybe over 50-60 and most of them are series, but without a doubt the best book i have ever read is 'The Bunker Diary' by Kevin Brooks. I remember being in waterstones and my mum saw it on the shelf, but usually i never go for thriller books, mainly romance or fantasy, so i gave it a go, and till this day it is my favourite book! It's a complete mystery, and the blurb doesn't give anything for the readers to go on, it's not predictable at all which is what surprised me all the way through!