The Mésalliance (Rockliffe #2)

The Duke of Rockliffe is in the market for a wife who will occupy her position with well-bred grace and chaperone his younger sister, Nell. What he does not need, therefore, is to find himself drawn to an infuriatingly sharp-tongued lady with a clutch of appalling relatives - namely, Adeline Kendrick. But so it is . . . and the result is what his world calls a mesalliance.

A sister novel to The Parfit Knight. Rated '2/5 - Behind closed doors' for steam/spice/heat level.