Snowbound with the Earl. Diamonds of London, #7.5

As the snow flies and the magic of Christmastide unfurls, a love from the past is resurrected. When Edward Gibson, Earl of Armestead hosts a house party at his country estate as he has every year since his father died, he resigns himself to the fact that he needs to scour the collection of eligible ladies, for he is in search of a wife. He has responsibilities to the title, but with his heart unexpectedly broken from a rejection years ago, he's ignored all of that. Lady Nancy Wooster, formerly Prentice, is the daughter of an earl.
Recently the widowed Viscountess of Havelock, she is glad her husband is six feet under, for his lies won her, and she'd made her decision based on that, but years later, she wonders if she didn't choose the wrong man. When a surprise invitation comes from Armestead's sister for a Christmastide house party, she accepts merely to stave off loneliness and curiosity. As the days slip by full of Christmastide fun and activities, Edward and Nancy are forced into each other's company, for the roads are impassible with snow and no one can leave.
As truths are revealed and secrets admitted between them, they accidentally discover a romance that never had a chance to flourish, but it takes one night of passion for them to see the truth that was waiting for them all along.