Queen of Hearts is the eighth in the cozy but really fun IMO Lady Georgie series by Rhys Bowen. It has dropped to $1.99 at Kindle and Kobo US.
Kindle US:
https://www.amazon.com/dp/B00G3L7X9Q/
Kindle US/Smile:
https://smile.amazon.com/dp/B00G3L7X9Q/
Kobo US:
https://www.kobo.com/us/en/ebook/queen-of-hearts-19