Who said "The game is afoot."?

This quote is attributed to Sherlock Holmes.

The game is afoot. - Sherlock Holmes

"The game is afoot."

Sherlock Holmes Adventure

"The game is afoot!"

"Elementary, my dear Watson."

"When you have eliminated the impossible, whatever remains, however improbable, must be the truth."

"I am not a romantic, but I am a realist."

"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."