Dr. Watson and Sir Henry Baskerville go to the Stapletons’ home to get some information about the escaped convict. Mr. Stapleton is out, and they are welcomed by his wife, who is hesitant to answer their questions. When her husband arrives, she quickly leaves the room, and he becomes more talkative. Sir Henry confronts him about the convict, but Stapleton denies knowing anything about it.

After the two men leave, they spot a light moving on the moor, which seems to be signaling to someone. Sir Henry wants to investigate, but Dr. Watson convinces him to return to Baskerville Hall.

The next day, Dr. Watson goes to the moor to investigate the previous night’s light. He encounters Mr. Stapleton and his sister, Miss Stapleton, who is the woman he saw in the portrait at Baskerville Hall. Miss Stapleton seems to be scared of her brother and begs Dr. Watson to help her escape from him.

As they are walking away, they hear the sound of a hound, and Miss Stapleton becomes terrified. She reveals that her brother keeps a large dog that he uses to scare her into submission. She believes that it is the same hound that has been terrorizing the Baskerville family for generations.

Dr. Watson tries to convince her to come to Baskerville Hall with him, but she insists on going to a neighboring town. As they are about to part ways, they hear the hound again, and Miss Stapleton becomes even more frightened. Dr. Watson tries to reassure her and tells her to meet him at the hotel in the nearby town. He then heads back to Baskerville Hall to inform Sir Henry of the situation.

The chapter ends with a note from Dr. Watson, stating that Sir Henry is determined to confront the Stapletons and that they plan to visit them again the next day.

Overall, this chapter provides important clues about the mystery surrounding the Baskerville curse. The fact that Mr. Stapleton denies any knowledge of the escaped convict is suspicious, and the appearance of the hound confirms that there is indeed a supernatural element to the story. Additionally, Miss Stapleton’s fear of her brother and the hound suggests that there may be a more sinister plot at work than initially thought.