This is a new author for me and I understand it is the end of this series. I was lost with the characters as I was unable to connect with them. Regular readers will enjoy the book. At the wedding of Flavia older sister, Flavia finds a finger in the cake. This started a new adventure for the team of Dogger and Flavia. She learned about the various abilities of the chemicals. They managed to visit an elder person in a retirement home to look for some missing letters. Flavia meets a couple of missionaries from Africa. Her cousin Undine plays an important role in the case. I recommend this book. Disclosure: Many thanks to NetGalley and Random House Publishing Group - Ballentine. The opinions expressed are my own.