Arthur Conan Doyle 
The Sign of the Four 

The Sign of the Four, also called The Sign of Four, is the second novel featuring Sherlock Holmes written by Sir Arthur Conan Doyle. Doyle wrote four novels and 56 short stories featuring the fictional detective. The Sign of the Four is the second of Arthur Conan Doyle’s Sherlock Holmes novels. In it the detective and his companion Dr Watson unravel a mystery of hidden treasure and murder. … By the end of the story the criminals are either dead or arrested, and Miss Mary Morstan and Watson are engaged to be married.