The Benevolent Society of Ill-Mannered Ladies by Alison Goodman
If you are a Bridgerton or Georgette Heyer fan, then you will enjoy The Benevolent Society of Ill-Mannered Ladies, a Regency romance novel with a hint of mystery.
Heyer created this genre, and as far as I can tell the plots have not changed since I enjoyed her books as a teenager. All the romance stock characters are present, the handsome rogue, the unappreciated spinster, the influential friend, the loyal servant, and of course, the evil oppressor.
Rather silly but easy!