Million Dollar Stud by Meg Lacey

Bored with his million-dollar lifestyle, Richard Darcy Kristof accepts a dare: live for one month with strangers and without his name or his fortune. He's up for the challenge. Calling himself Darcy, he gets a job managing a horse farm. But nothing has prepared him for the challenge of the boss's gorgeous daughter—Silver Braybourne.

Silver's future is riding on one horse and its ability to win. She's not about to let anything stand in her way, least of all a new manager who's too arrogant, too sexy for his own good...and hers. If she gives in to the temptation of Darcy, she can again focus on her future. Too bad once isn't enough....