The Mary Russell series has been extremely enjoyable, although for me this novel and "The Moor" stand out. Throughout the series we have learned about Mary's past and the tragedy that overcame her family, sending her to Sussex where she met Sherlock Holmes.
"Locked Rooms" uses the loss of her family as a central theme and following a series of nightmares during the voyage to San Francisco (where Mary must deal with business matters) Mary is compelled to revisit the terrible events that lead to the death of her parents and brother.
The story is well structured and is an excellent mystery with an ending that doesn't disappoint. It uses the San Francisco earthquake and fire as a background for earlier events; the effect of the 1st World War on the younger generation is also shown in the brittleness of some of the new friends that Mary makes during the course of the story.
I would recommend this to anyone who enjoys a well written, thoughtful mystery. Laurie R. King has great skill in developing character and in creating a psychological aspect to her stories that give them depth. This, along with the rest of the series, is highly recommended.