Mrs. Jeffries Reveals Her Art is the 12th in the Mrs.Jeffries series by Emily Brightwell. It has dropped to $1.99 at Kindle and Kobo US.
Kindle US:
https://www.amazon.com/Mrs-Jeffries-...dp/B00AFZTN5I/
Kobo US:
https://www.kobo.com/us/en/ebook/mrs...eveals-her-art