A Rather Charming Invitation by C.A. Belmond (2010)

Another enjoyable Penny Nichols story. They are getting ready for their wedding and there are factions of Jeremy's family - his grandmother - and Penny's French side of the family vying for their attention and wanting to control the wedding. The French family offers a tapestry of a wedding for the ceremony and that sets off a hunt into the past of both the family and French royalty. So Penny's historical knowledge and sleuthing come into play again. We see some of the family members from the previous books and are introduced to new ones. I liked Honorine, who wants to get away from her family and the perfume business, so she knocks on Penny and Jeremy's door in London and ends up being their assistant for a while. When she goes on to her own life at the end of the book, I realize how much they need an assistant. Looks like there is one more book in this series.