When Harrison Tolly learns he is the rightful heir of Ashwood, he tells the messenger he does not want it. He is already the steward of vast holdings of the Jameson family, which includes the Viscount Carew and his wife, Lady Carew, and he has a young, pregnant wife. How could he give that up? But Harrison Tolly has a secret. The young woman is not his wife, but the sister of Lady Carew, who had been impregnated by her sister's husband, Lord Carew. Harrison Tolly has agreed to pretend she is his wife because he has been secretly in love with Lady Carew since the earl brought her home after a London Season. Olivia Jameson, Lady Carew, is unaware of Harrison's devotion to her. She is trapped in a loveless marriage, and does not know that he is the one who has begun to secretly woo her with small, discreet gifts, and messages. Writing letters to this Scarlet Pimpernel (and signing them Lady X), she realizes she is falling in love with him, whoever he may be. And after an unexpected tragedy occurs, the identity of her mysterious suitor becomes known when he comes to her room in the middle of one steamy night..