Quotation from: The Adventures of Sherlock Holmes

Written by: Sir Arthur Conan Doyle

"What is the meaning of it all, Mr. Holmes?"

"Ah, I have no data. I cannot tell. Perhaps you have yourself
formed some opinion?"

"Well, there seems to me to be only one possible solution. Mr.
Rucastle seemed to be a very kind, good-natured man. Is it not
possible that his wife is a lunatic, that he desires to keep the
matter quiet for fear she should be taken to an asylum, and that
he humours her fancies in every way in order to prevent an
outbreak?"