She loved him but couldn't marry him

Cynara hadn't seen Zack Buchanan in five years, not since she'd hurt him--hurt herself even more--by leaving him.

She'd let Zack think the worst of her to avoid watching his love slowly turn to ashes. But now that he'd stumbled across her singing at one of his hotels in London, she knew that he intended to exact payment for the past.

She knew, too, that she would bargain with the devil himself to be with Zack again--as long as she could keep secret her reason for never marrying....