The Moor by Laurie R. King

This is the fourth book of the Mary Russell & Sherlock Holmes series.  While I enjoyed the growing characters, especially of Mary and the interaction between she and Holmes; this wasn't my favorite in the series.  It could have just been the setting - the Moors are dark and dreary and depressing (alas, I won't be reading Wuthering Heights any time soon).  It was interesting to discover that the a main character in this, Reverend Sabine Baring-Gould, was actually a real person.
The next in the series takes place in Jerusalem, maybe not exactly a perky location, but hopefully a little more uplifting than the Moors.