How to Marry a Marquis — Julia Quinn

When James Sidwell, Marquis of Riverdale, offered to help her find a husband, he never dreamed that the only candidate he could propose would be himself....

SHE'S TRYING TO FOLLOW THE RULES

When Elizabeth Hotchkiss- stumbles upon a most intriguing book, How to Marry a Marquis, in her employer's library, she's convinced someone is playing a cruel joke. With three younger siblings to support, she knows she has to marry for money, but who might have guessed how desperate she's become? A guidebook to seduction might be just the thing she needs--and what harm could there be in taking a little peek?

BUT HE'S MAKING HIS OWN

James Sidwell, the Marquis of Riverdale, has been summoned to rescue his aunt from a blackmailer, a task that requires him to pose as the new estate manager--and he immediately sheds suspicion on his aunt's companion, Elizabeth. Intrigued by the deliciously alluring young woman with the curious little rulebook, he gallantly offers to help her find herself a husband...by practicing her wiles on him. But when practice becomes all too perfect, James decides there's only one rule worth following--that Elizabeth marry her marquis.