CRYPTANALYSIS MINUTE The Ledger

The groups are not cipher. That is why eleven weeks of attack yielded nothing: there is no key, because nothing is locked.

Shift each figure down by one — a lamp trick, one turn — and the thirteen groups resolve into Directorate service numbers.

I have identified twelve of the thirteen. All twelve belong to officers now dead: the earliest in March 1974, the latest in November 1986. And the groups that have so far fallen silent were silenced on the anniversary, to the night, of the death of the officer whose number they carry. Group seven fell silent on 25 March. The officer whose number it carries died on 25 March 1974, lost at sea, operation CANDLE, verdict misadventure.

This is not a message and it never was. It is a ledger, and someone is reading the dead out of it, one anniversary at a time. By my reckoning the last of the twelve falls silent in early October. Then a single group will remain, and the voice will read one number, alone, to whoever is listening.

The thirteenth number is active. The service record it resolves to is sealed above my clearance. My request for access is attached.

Attached request, returned same day. Stamp: DENIED. Authority: DDO. No reason given on the form; the form has a space for one.