Starting at no 6 means that there is a back story that needs to be caught up on. Though it can be read as a stand alone.
Dr. Thomas Silkstone is an anatomist who is called in at the death of Sir Montagu Malthus at Boughton Hall, the lawyer for Lady Lydia Farrell who found the body.
What connection is there to a stolen diamond in India and various army officers.
Will probably read the first book to see how I enjoy the start of the story.
A NetGalley book

I received a free copy of this book through Net Galley.

If you enjoy old-fashioned period mysteries, you might like this. I haven't read any of the other books in the series, but if you read and enjoyed them, I'm sure you'll like this. It's perfectly well-executed, but it couldn't hold my attention for more than a couple chapters at a time. I'm usually a pretty fast reader, but this book felt like it took years to get through because I just could not bring myself to take any interest in anything that happened. The mystery wasn't interesting, the characters weren't interesting, nothing about it was actually interesting for me.

It isn't even bad in any significant way, just painfully dull. It wasn't even interesting enough to hate.