Private inquiry agent Mr Carlyle, urgently seeking an authoritative opinion on the provenance of an antique coin, is directed to the home of Mr Carrados, expert numismatist and specialist in identifying forgeries. Upon his arrival, the two men recognise each other as old schoolmates, and Carlyle is shocked to discover that his friend is now completely blind. Yet his pity is misplaced - the urbane Carrados is remarkably skilled in deduction, interpreting his exquisitely precise sense of touch, and analysing his manservant's detailed visual observations. So when he informs Carlyle that he harbours an ambition to become a detective himself, an investigative partnership is born
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