Quotation from: The Adventures of Sherlock Holmes

Written by: Sir Arthur Conan Doyle

"He looked very hard at me as I spoke, and it seemed to me that I
had never seen so suspicious and questioning an eye.

"'Do you promise, then?' said he at last.

"'Yes, I promise.'

"'Absolute and complete silence before, during, and after? No
reference to the matter at all, either in word or writing?'