When Sir Charles Baskerville is found dead in his country house, Baskerville hall, Dr. Mortimer, his friend, goes to London to seek Sherlock Holmes’s help. He asks him about what to do with the new heir and tells him about the family curse of a hellhound. After this, the doctor reveals that there were footprints of a hound next to the dead body of Charles Baskerville. He then tells that Charles
Baskerville appeared to be waiting for someone and that his footprints showed him running away.
He had a weak heart and therefore died from a heart attack. Sherlock Holmes and his sidekick, Dr
Watson, intrigued by the case agree to help.

Sir Henry, the heir, who arrived from Canada receives a note at his hotel which warns him to stay away from the Devonshire moors (where Baskerville Hall is). On seeing the note, Holmes recognizes cut out letters from the previous day’s Times and is able to deduce that it was written from a hotel and that it was written by a women. Sir Henry also has one of his new boots stolen.

Once Sir Henry had been told of the situation, he and Holmes decide to meet again later that day, once Holmes has had time to think. Holmes and Watson trail Sir Henry and Dr Mortimer on their way back to the hotel and discover that a man with a black beard is following them in a cab. When the man finds out that Holmes had seen him, he drives away. However, Holmes is able to get the cab number and employs someone to find out copies of the Times in hotels which have letters cut out from them.

By the time Holmes goes to the hotel, Sir Henry has another boot stolen. This time it is an old one.
When they discover the first missing boot, Holmes realizes that they must be dealing with a real hound because the boots must have been stolen to gain Sir Henry’s scent. Holmes then tells them about the man with the beard and Dr Mortimer tells him about Barrymore, the servant at Baskerville
Hall, also has a beard and a telegram is sent to check on his whereabouts.

At the end of the meeting, it is decided that, Holmes being tied up in London with other cases,
Watson will accompany Sir Henry to the Hall and send reports back to Holmes. Later that evening, through some telegrams, Holmes finds out that his investigations into the other leads have failed.

Dr. Mortimer, Watson, and Sir Henry set off for Baskerville Hall the next day. Dr Watson begins his investigation by meeting with several people from the moor who are Barrymore, the Stapletons and Mr Frankland and Laura Lyons. He is able to find out that an escaped convict, Selden, is the brother of Mrs Barrymore and that there is an unknown man in the moors. Watson decides to investigate this and finds out that the unknown man was actually Holmes. Holmes explains that he kept his location a secret so that he would be able to appear on the scene of the action at the critical moment. Their conversation ends with them hearing the scream of a man. They find a dead body from the source of the screaming and initially think it is Sir Henry. They then realize that it was
Selden in Sir Henry’s clothes. Then Stapleton appears and he makes excuses for his presence.

Holmes and Watson then return to Baskerville Hall, where over dinner, Holmes realizes the similarity between Hugo Baskerville’s portrait and Stapleton. This leads Holmes to realize that Stapleton is a Baskerville and wanted to kill Sir Henry so that he would become the heir and could claim the
Baskerville fortune. They then go to Mrs Lyons place and get her to confess Stapleton’s role in the letter that was the setup to kill Sir Charles. They then go and meet Lestrade, an officer from Scotland
Yard.

They then go and wait outside Merripit House where Sir Henry is dining. When Sir Henry leaves, they see a hound let loose that gives chase to him. Before it is able to hurt him, Holmes and Watson are able to shoot it. They then go to Grimpen Mire to search for Stapleton but when they don’t find him, he is presumed dead.