"One A, two B, and so on. You will hear soon." [REDC]
The secret code that Genarro and Emilia Lucca shared for passing messages to each other in "The Red Circle" was straightforward. Or was it?
In 1956, Donald Yates—then a 26 year-old budding Sherlockian—made an observation about the code, the alphabet(s), and the credit that was due to Sherlock Holmes for his invisible but lightning-quick analysis. It's just a Trifle.
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