Sherlock Holmes and Doctor Watson 1980 S01E07

Episode: The Case of the Blind Man's Bluff. Two strange murders have been committed, with the perpetrator appearing to be blind and each victim being found in possession of a chicken claw with a black ribbon tied around it. Lestrade goes to Holmes for help with the case. Holmes recognises the chicken claw as a traditional voodoo death warning in Trinidad. A third murder takes place at the Kensington Marine Hospital, and Holmes determines that all of the victims had previously served together on the same cargo ship.