Finding thrillers

There is something I love to do when I go to a bookshop, any bookshop, it is to find at random a book to read I knew nothing about. Amazon gives me very accurate suggestions, but it is a bit creepy and it lacks the spontaneity of the bookshop experience, when I know I truly buy it of my own free will. So anyway, on my last visit to the local bookshop I discovered This is Gomorrah by Tom Chatfield. No idea if it is a good or a bad thriller, I don't know the author, I know very little about the book except that it is a modern techno thriller, not a genre I particularly like, but the cover got me curious. I don't know when I will read it either, probably later in the year during Noirvember, or even next year. But it's just nice to find a book at random like that.