Caroline Kepnes's bestselling thriller You (£9) made its way to the small screen after the unsettling book shook up crime fans. The first book in the series follows Joe, a New York City bookstore manager who becomes more and more obsessed with a young woman, Beck, who comes into his store one day. Over the course of a few months, Joe's obsession with Beck reaches horrifying heights, resulting in things like breaking and entering, stealing underwear, and even murder.