If their intentions are evil they might do you a mischief, and we should be powerless to prevent it.

You did not know, Dr.Mortimer, that you were followed this morning from my house ?" Dr.Mortimer started violently.
"Followed! By whom ?" "That, unfortunately, is what I cannot tell you.

Have you among your neighbours or acquaintances on Dartmoor any man with a black, full beard ?" "No--or, let me see--why, yes.

Barrymore, Sir Charles's butler, is a man with a full, black beard." "Ha! Where is Barrymore ?" "He is in charge of the Hall." "We had best ascertain if he is really there, or if by any possibility he might be in London." "How can you do that ?" "Give me a telegraph form.

'Is all ready for Sir Henry ?' That will do.