The Incomparable Countess / Tavern Wrench (Regency Lords & Ladies #19)

The Incomparable Countess by Anne Ashley
For one long, hot summer Frances and Marcus had meant everything to each other. And then he betrayed her by marrying someone else. At seventeen, Frances had possessed an inner fire, a joy of life. Now, years later, Marcus, Duke of Loscoe, is confounded by the ice-cold society hostess she has become.

Having learned how to suppress her youthful dreams and desires, Frances, Countess of Carringham, can't deny she's pained to hear that Marcus is looking for a new wife to care for his motherless child. Nor can she disguise that she is still susceptible to his charm...

Tavern Wench by Mary Nichols
Alone in the world, too proud to accept charity, vicar's daughter Emma Lynn earns her living by cooking - in a tavern! But her independence has a heavy price: a tavern wench isn't fit to mix with the gentry, and Emma has turned her back on the Polite World.

Mr. Benedict Grantley, amateur sleuth and baronet's heir, isn't going to let Emma's principles stand in his way. As Ben uncovers the startling truth about a series of murders, Emma is thrust into Society...thrown into danger...and plunged into love!