The Murder of Mary Russell is I believe the 9th or 10th book in the Mary Russell Mystery series. I love them all. Mary Russell is the young wife of Sherlock Holmes. She is the main investigator and heroine while he is her partner. The books are almost all from Mary's point of view and she is a delightful narrator. In this book, Mrs. Hudson comes home to find blood and disarray and she fears the worst. No one can find Mary and the scene is grim. I was quite worried that this would be the final book in series but I found that much of the story focused on the back story of Mrs. Hudson and how she came to be in the employment of Holmes. It was so interesting and well written. It wove in perfectly with the disappearance of Mary. I will not spoil the story but I can say that I was riveted from beginning to end, not because of any intense amount of action of emotion, but because Laurie R. King's stories are so engaging. I certainly hope this isn't the last of this series.