Fifty Shades Darker (#2) by E L James

Daunted by the singular tastes and dark secrets of the beautiful tormented young entrepreneur Christian Grey, Anastasia Steele  has broken off their relationship to start a new career with Seattle publishing house.

But desire for Christian still dominates her every waking thought and when he proposes a new arrangement, Ana cannot resist. They rekindle their searing  sensual affair, and Ana learns more about the harrowing past of her damaged, driven, and demanding Fifty Shades.

While Christian wrestles with his inner demons, Ana must confront the anger and envy of the woman who came before her, and make the most important decision of her life.