A Conspiracy in Belgravia by Sherry Thomas

The first book in this series introduced the world to Charlotte Holmes, the woman behind the myth of Sherlock Holmes. In this book, her life starts to get more complicated. First, the wife of Charlotte's one-true-love (or at least one of the people she cares most deeply for), comes to Sherlock Holmes for help. She wants to find her childhood crush, a man who supposedly met her every year on the Sunday before his birthday. Never meeting or talking, just a distant nod. This year, he didn't show. And it turns out this man has a mysterious tie to Charlotte.
Charlotte also has to contend with a marriage proposal from a man who courts her with puzzles. She has another mystery of a woman who thinks her father is poisoning her. And she has to figure out how to get back her sisters.
The strength of Thomas in this book is her ability to paint her characters. We get more of the inscrutable Charlotte, seeing that she is not completely unfeeling, just rarely does she feel it deeply enough to express it. We learn more about Inspector Treadles, about how deeply he loves his wife but how much that love may be tested against his notions of how men and women should act. We meet the inspiration for Mycroft: Lord Bancroft, Lord Ingram's brother.
I think I may have rated this book higher except that I was judging it against the first. Three and a half stars is still pretty high.

Follows A Study in Scarlet Women