See Duncan Ross.
Clay's apparent desire to learn the pawnbroking trade and his hobby of photography, like the assumed name of Spaulding, mask his intent to rob the City and Suburban Bank. Identified as a "murderer, thief, smasher, and forger," he is skilled enough at crime to have eluded the police for years. Holmes seems almost respectful when he identifies Clay as "the fourth smartest man in London" and compliments him on the ingenuity of his scheme. Clay's acid-splashed forehead and pierced ears hint at a colorful past, but the reader learns little about him aside from his royal blood, aristocratic education, and extreme pride. These attributes suggest that Clay was led to crime by the challenge, rather than the need for money. He may even have a Robin Hood-like motive of stealing from the rich to aid the poor, since police agent Jones mentions that Clay "will crack a crib in Scotland one week, and be raising money to build an orphanage in Cornwall the next."
Holmes's reputation as a lover of puzzles and solver of crimes leads people with particularly baffling problems, like the one confounding Jabez Wilson, to seek him out. Holmes possesses a nearly superhuman ability to read a person's background by observing small, seemingly-insignificant details, and Watson states that Holmes's powers of reasoning make him appear to be "a man whose knowledge was not that of other mortals." Holmes is aided in his task by a thorough familiarity with previous criminal cases and the inhabitants of London's underworld, along with a scholarly knowledge of such obscure topics as varieties of cigarette ash and kinds of tattoo marks. Possessing a sort...
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