I am reading this series from the beginning and this, the third book is absolutely my favorite so far. That being said I am a medical professional and love medical history. If you are interested in the current controversy over vaccines and autism and/or are interested in diphtheria and a good mystery with a female protagonist who happens to be a priest this book is for you. I must say it encompassed all my interests (except dogs :-)) and was well researched and written. I guess you can tell I loved it!