I adore pretty much all of Madeline Hunter‘s covers. Dangerous in Diamonds concludes a series I really loved, set in the Regency era. Definitely read these books in order!
In fact, the reason I started reading this author is because of this particular book cover. When I found out it was at the end of a series, I bought all of the books!
I’m yet to buy these in paperback, but I plan to soon.