I enjoy the novels that this husband and wife team write about the late Victorian era. What I like the most is the extensive research that they put in each book, as well as the real life characters from that time that they insert in major roles in each story. This book is no exception. It was a fascinating insight into the infamous Whitechapel murders, and a very plausible theory as to who committed the crimes. Kathryn and Charles are wonderful sleuths, and in this book we see a very innovative Kathryn do some undercover detective work. Unfortunately, I had figured out the murderer of the blackmailer early in the narrative, but that didn't take away from my enjoyment of the book. This is a fun series, and you'll find that you become strangely attached to these people as you read.