What a cute story! The heroine, Esmeralda, runs an employment agency for chaperones, governesses, etc. She doesn’t accept jobs herself as she has a younger sister, Josephine, to care for.
Griffin is a duke who needs a chaperone for his twin sisters ASAP as his aunt is ill. This will be Sara and Vera’s first season. When he visit’s Esmeralda’s agency he decides he wants her to be their chaperone and will let her bring Josephine and her dog if she’ll agree. He also offers a very nice wage, including some new dresses for her.