Ace of Hearts - The House of Cards Trilogy, #1

Never did Alexander "Ace" Endicott, the Earl of Cards, imagine himself to be thrice-betrothed against his will by the doings of three desperate debutantes. So he escapes London to his property in the country, where he follows through with his deceased father's last wish-to find his long-lost step-sister. His search takes a detour and leads him to Nell, who piques his interest. Now, Ace may have to reconsider his rejection of marriage and see if two mismatched lovers can make a royal pair.