Sherlock Holmes ; 4 or 7, depending on how you are counting.
This is the fourth and final of the novels by Doyle. In it Holmes and Watson head to Birlstone Manor to investigate a murder, having been first warned that Moriarty may be involved. There is much deducing and eventually Holmes has the case figured out, but the book is only half over. The second half of the book concerns goings on some years before in a mining town in Pennsylvania and the murderous gang of freemasons that run it.
Overall it is an enjoyable enough story, but I had everything pretty much figured out before the story ended. Nevertheless it is told in an enjoyable manner, and if you are a Holmes fan you’ll want to give it a go.