The author biuld suspense when there was two dead ends. The first dead end was when the man in the carrier had a beard, and Holmes thought it was Barrymore who has the SAME beard and when they invited him to dinner, he wrote a letter that said he is at Baskerville Hall so he won't be coming to dinner.
The second dead end was when Holmes followed a man when he was in a carrier then the man said he has been followed (but Holmes thought it would be the guy with the beard) but it turned out that he (the men in the carrier) has been followed by Holmes.
So Sherlock Holmes had to go to Baskerville Hall to investigate the man with the beard...

The author biuld excitement when Watson when to the hillside in the Moor and they saw a young boy walking around and then later on when Watson came to see him, it was Sherlock Holmes which surprised me and Watson because he was suppsoe to be in solvind another case in London, but really he tricked Watson and Sir Henry to think that Holmes is not here so Sir Henry would be on guard (meaning he would do his "thing") because Holmes is not there, and because Sir Henry knows that Holmes would solve the case in no time and that Watson is not like Holmes, Watson takes longer to solve the case. ( )