"Was ever such bad luck and such bad management, too?
Watson, Watson, if you are an honest man you will record this also and set it against my successes!" "Who was the man ?" "I have not an idea." "A spy ?" "Well, it was evident from what we have heard that Baskerville has been very closely shadowed by someone since he has been in town.

How else could it be known so quickly that it was the Northumberland Hotel which he had chosen?
If they had followed him the first day I argued that they would follow him also the second.

You may have observed that I twice strolled over to the window while Dr.Mortimer was reading his legend." "Yes, I remember." "I was looking out for loiterers in the street, but I saw none.
We are dealing with a clever man, Watson.

This matter cuts very deep, and though I have not finally made up my mind whether it is a benevolent or a malevolent agency which is in touch with us, I am conscious always of power and design.

When our friends left I at once followed them in the hopes of marking down their invisible attendant.