"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. ATTENTA: Don't forget: if you're interested in receiving some free back issues of The Baker Street Journal, we hold a drawing every month for our Patreon supporters. To be eligible to participate in this monthly drawing, go to patreon.com/trifles. Sponsor: The BSI Press Full show notes: https://ihose.co/trifles266 --