The bottle seemed to contain no liquid, but it was securely corked. And, on holding it against the light, the Black Eagle could see what appeared to be a strip of folded paper inside. What is the secret of the bottle that was buried under a boulder in the Bois? Whatever it was, it forms the clue to the amazing series of events so absorbingly described in this narrative -one which tells of the second encounter between Sexton Blake and the man from Devil's Island -the Black Eagle. Bonus - This publication is supplemented with "Mystery Island, " which appears to be part of a serial publication in "Pluck Library" magazine, but it also stands alone as a good short story by Teed