Sir Henry comes with Dr. Mortimer to Sherlock Holmes. Sherlock and Dr. Mortimer tell the new owner of Baskerville Hall, Sir Henry about their fears and apprehensions of this house. Sir Henry has also to tell somthing. Namely, that an unknown person followed him. He became also a "threatening letter", inside stood:"As you vollue your life or your reason keep away from the moor." All words were clipped out of a Newsletter, except the word "moor". Sir Henry shoe disappearances. And on way to the hotel Northumberland, in wich Sir Henry present is living, they get to fallow of an unknown prson in a carriage and with a black mustache.