Sign of Four
Sherlock Holmes #2
a man is murdered. He is connected to another missing man, who has a daughter who comes to Holmes and Watson. Turns out there is a huge indian treasure involved. 4 men stole it and hid it. Then went to prison. The murdered and missing man found out about it and made a deal to free the prisoners for a part. Backstabbing. Prisoner escapes and takes his revenge. Watson ends up marrying the daughter.