This book convinces with the same things as the previous ones: The case is interesting, and it has Enola solving it with her own knowledge different to Sherlock's before him, and it gets develops the relationship between Enola and her brothers. Yes, brothers, plural, for Mycroft has got a bigger role in this book as well, and I tremendously enjoyed the interactions between the three Holmes siblings and the development their relationship(s) took during this book. The part of me that got invested in it is really happy about it XD Now onto the next one.