He is directed to the home of Wynn Carrados at The Turrets, Richmond, London, for an expert opinion on a tetradrachm of Dionysius the Elder of Sicily which he believes may be a forgery substituted into a famous collection in the course of a theft.
Max explains that he was made financially independent by a rich American cousin who left him a fortune won by doctoring his crop reports, on condition that he adopt the surname Carrados.
Carrados enjoys the éclat of revealing his explanations of mysteries through powers of perception, which ought to be at the disposal of any sighted person, but which in his case are heightened in positive compensation for his visual impairment.
The problem of the forged coin (his first 'case'), including the names of the collector, the forger and the thief, and the method, is explained to Carlyle without Carrados ever leaving his study.
Carrados is portrayed by Robert Stephens in a 50-minute adaptation of "The Missing Witness Sensation," an episode of the 1971 TV series The Rivals of Sherlock Holmes.
A single episode entitled "The Holloway Flat Tragedy"[7] from August 18, 1942, featured British actor Alfred Shirley as the blind detective.