Everyone knew Lady X or, at least, everyone knew of her. The masked courtesan was reputedly a noblewoman fallen on hard times. What Lord James had not known was that she was Lady Margaret Wentworth, the feisty sister of his best friend. Gerald claimed his sibling was beautiful, virtuous, naive; and he had forced James into an oath of protection. But when James tracked the girl down to a house of ill repute, what other explanation could there be but that Maggie was London's most enigmatic wanton?