Sherlock Holmes took Dr Watson to see his brother, claiming that the hitherto unknown Mycroft was an even more observant detective that he was himself. Watson was doubtful, and when the two brothers demonstrated with an analysis of a widowed soldier seen through the windows of a London club, he began to think they were pulling his leg.

Watson’s scepticism vanished after Sherlock and his brother painstakingly explained how they had deduced so much about the widowed soldier from India; and the doctor not only gained a new respect for his friend Sherlock’s extraordinary powers, but began to credit his claim that Mycroft might possess them to a yet greater degree.

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