A Holiday By Gaslight by Mimi Matthews

A Courtship of Convenience. Sophie Appersett is quite willing to marry outside of her class to ensure the survival of her family. But the darkly handsome Mr. Edward Sharpe is no run-of-the-mill London merchant. He’s grim and silent. A man of little emotion–or perhaps no emotion at all. After two months of courtship, she’s ready to put an end to things.
A Last Chance for Love. But severing ties with her taciturn suitor isn’t as straightforward as Sophie envisioned. Her parents are outraged. And then there’s Charles Darwin, Prince Albert, and that dratted gaslight. What’s a girl to do except invite Mr. Sharpe to Appersett House for Christmas and give him one last chance to win her? Only this time there’ll be no false formality. This time they’ll get to know each other for who they really are.