Scandal's Deception (Scandal #4)
Pamela Gibson

Gilbert Carmichael, Lord Ralston, chafes at having to make a rebellious young heiress acceptable to society, especially one who is impetuous and blatantly democratic. Because the instruction she needs is more than deportment and dancing. It’s also about how to spot a rake who might woo her for her fortune.
When Ralston learns his ward is to be used as a pawn in an elaborate scheme involving a secret impersonation, he will move heaven and earth to keep her safe. Because proximity has brought the uncomfortable knowledge that his interest may be more than duty—it just might be love.