Holmes tells Watson to simply report the facts to him:
"Anything which may seem to have a bearing however indirect upon the case, and especially the relations between young Baskerville and his neighbours or any fresh particulars concerning the death of Sir Charles
If they are innocent (The Barrymors) it would be a cruel injustice, and if they are guilty we should be giving up all chance of bringing it home to them. No, no, we will preserve them upon our list of suspects. Then there is a groom at the Hall, if I remember right. There are two moorland farmers. There is our friend Dr. Mortimer, whom I believe to be entirely honest, and there is his wife, of whom we know nothing. There is this naturalist, Stapleton, and there is his sister, who is said to be a young lady of attractions. There is Mr. Frankland, of Lafter Hall, who is also an unknown factor, and there are one or two other neighbours. These are the folk who must be your very special study."
Just for the fun of it, Whom do you believe among those listed above would lest likely profit from the young heirs death?