Miscellania
- Harry Paget Flashman witnesses the events of this story in the novel "Flashman and the Tiger" by George MacDonald Fraser.
- The Tankerville Club which Colonel Moran is a member of is also mentioned in the short story "The Five Orange Pips" in which John Openshaw says that Holmes saved club member Major Prendergast from public scandal.
- The fictional martial art baritsu is named in the story. There is speculation that it may be a misspelling of Bartitsu, or a deliberate anachronism.
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