Overview
Holmes & Watson receive a letter from an informant who known by the pseudonym Fred Porlock. Porlock is a man well connected with criminals. The letter is written in code, and Holmes determines that the code comes from the words in a book. They decipher the code by page and column and find that John Douglas of Birlstone House is in danger.
| Actor | Age then | Age now | |
|---|---|---|---|
 | 50 | December 14, 2013 (81) | |
 | - | - | |
 | - | - | |
 | 37 | 80 | |
 | 53 | February 11, 2020 (90) | |
 | 36 | November 22, 2015 (69) | |
 | 39 | 81 | |
| - | - | |
| - | - |