Fifty Shades of Grey, and the sequel, Fifty Shades Darker, by E.L. James. I just finished them both in the span of a week and went back and started reading them again. Soooo good. Trashy good. It's a trilogy and the final book is coming out January 19 so if I could go back and do it over again, I would wait until mid-january to start reading the first one so that I wouldn't have this agonizing wait. They're that good.