His Christmas Match (A Gentleman's Guide to Once Upon a Time #4)
Jane Charles

Rosalind Valentine has been in love with Marquess Felding since she was in the schoolroom. She also knows that he will never be hers given her humble background and family secrets. As much as it pains her to watch him court another, Rosalind knows it is for the best and is determined to be content in her position as a nursery maid and companion.
Noah comes to realize that the lady he was about to settle for is not someone he wants to be tied to for life. When Miss Rosalind Valentine accompanies his sister to a house party, he begins to see her in an entirely different light. Had he been looking in the wrong place for love? Had she been as close as next door? Will blackmail keep him from making a Christmas Match?