Who said "The mystery deepens."?

This quote is attributed to Dr. John Watson.

The mystery deepens. - Dr. John Watson

"The mystery deepens."

Dr. John Watson

Character in The Adventures of Sherlock Holmes

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"I am not quite so dense as you make me out to be."

"Holmes is a law unto himself."

"This is indeed a mystery."

"I have nothing to do today. My practice is never very absorbing."