I like this book a lot. I loved the introduction and the story behind how the story came to be. Mary Russell is a strong smart woman and Sherlock sees that from the start. The writing really drew me in and I had a hard time putting it down. The book is thicker and more complex than it looks and it made me happy. I wanted to immediately pick up the next one in the series. I really enjoy how much independence Mary gets and how much Holmes trusts her.
I do feel the morarity storyline and the suicide were a bit redundant. Mainly because I recently re-watched Sherlock and since essentially the same storyline was used there, it felt overplayed. But maybe Sherlock stole the idea from Laurie R. King.