Quotation from: The Adventures of Sherlock Holmes

Written by: Sir Arthur Conan Doyle

"But your client--"

"Never mind him. I may want your help, and so may he. Here he
comes. Sit down in that armchair, Doctor, and give us your best
attention."

A slow and heavy step, which had been heard upon the stairs and
in the passage, paused immediately outside the door. Then there
was a loud and authoritative tap.