The Tart Shoppe (Harlequin Regency Romance Series 2 #3)
Phyllis Taylor Pianka

The sign outside The Tart Shoppe door came as a welcome relief to Lady Constance. She and her Aunt Millicent were travelling from Cornwall to London. Yet afflicted as she was with a violent illness, Constance simply had to lie down. Surely this country house would not deny them lodging for the night....
The inn was unexpectedly comfortable--and strangely ornate. Little did Constance suspect what events would befall her. In her exhausted slumber she didn't know that Jeremy St. James, a rakish earl, was frequenting the establishment... nor did she stir when he knowingly entered her bedchamber!