Frankincense and Folly by Laura Rollins

Their meddling is meant to stop a Christmas wedding—not spark another romance

Miles, Lord Bartlett, and the young widow Lady Jane Westwood had no designs to spend another Christmas in each other’s company, but an unforeseen circumstance forces them to do just that. Miles’ mother and Jane’s dear friend, a retired sergeant, decide to marry after having been acquainted for only ten days.
Miles and Jane quickly form an alliance with a single aim in mind: to stop this seemingly ill-fated union. Jane, who faced a similar situation in her first marriage, is certain the disparity in their social stations can only lead to disaster, while Miles is convinced the sergeant is pursuing his mother for her wealth alone.
Among Christmas carols and evergreen boughs, Miles and Jane soon find themselves battling not only the romance of the season but also their growing attraction to each other. Will their meddling antics bring love this Christmas season, or only heartbreak?