The Adventure of the Missing Three-Quarter (The Return of Sherlock Holmes, #11)

Another interesting short story from Sir Arthur Conan Doyle - 'The Adventure of the Missing Three Quarter.'

As Doctor Watson writes: "We were fairly accustomed to receive weird telegrams at Baker Street, but I have a particular recollection of one which reached us on a gloomy February morning, some seven or eight years ago, and gave Mr. Sherlock Holmes a puzzled quarter of an hour. It was addressed to him, and ran thus: 'Please await me. Terrible misfortune. Right wing three-quarter missing, indispensable to-morrow. OVERTON."

Can you make anything of that?