This story was written by Sri Arthur Conan Doyle. It is an adventure about a detective called Sherlock Holmes.
A friend of Sherlock Holmes, Dr. Watson, tells the story.
Sherlock Holmes is not policeman. He is a private detective. People pay him to find things that arelost or stolen.
Holmes also solves mysteries and catches criminals.
This story takes place in 1889. There were no tele-phones at this time. If someone wanted to send an important message quickly, they sent a telegram.
The Hound of the Baskervilles takes place in the south-west