By day, Lena Morrison is an ambitious grant writer. By night, she's an escort to some of Chicago's most successful men. Sex isn't on the menu—Lena's job is to provide her elite clients with companionship and sparkling conversation. She enjoys the extra income, but even more, she loves the empowering feeling of being admired for her beauty and her brains.  When billionaire Roderick Brand hires Lena as his date for a private party, their electric attraction leads to the most erotic night of her life. As incredible as the experience is, she vows not to mix work and pleasure again. But Roderick is relentless. His irresistible proposal: three weeks fulfilling all his fantasies, in exchange for a million-dollar grant that will guarantee her a major promotion.  Lena can play that game. She'll give Roderick the hottest, wildest sex he's ever had. Then she'll walk away, leaving him aching for more. But when it comes to desire, rules—and hearts—are easily broken. And the best-laid plans have a way of working out in ways neither could expect….