Sinopsis

The communicating time will be here soon. I have started this letter early to
be sure it will be ready. This is the first time I have felt safe when
communicating with you. Our enemies at home can solve such
extraordinarily complex ciphers that I have always been uneasy before.
They cannot possibly solve an entirely new language like this one; a
language based on an utterly different theory from our own; with new
symbols; and even set down with a different writing instrument. Our long
periods of study together have brought their reward. Your Excellency, I
appreciate the rare privilege of knowing a language that only one other
person at home knows, and that one person, yourself.
...