Who said "The case has been an interesting one."?

This quote is attributed to Sherlock Holmes.

The case has been an interesting one. - Sherlock Holmes

"The case has been an interesting one."

Sherlock Holmes Adventure

Character in The Hound of the Baskervilles

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"The world is full of obvious things which nobody by any chance ever observes."

"The moor is a dangerous place, Watson."

"I cannot but think that you are justified in your caution."

"One should always look for a possible alternative."

"The greatest adventure is life itself."

"The adventure of life begins with a single step."

"Adventure finds you when you stop running."

"Fortune and glory, kid."