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Real pages from the case file · 17 pages in the PDF

At 0347 the Y-Service station at Beaumanor intercepts an unfamiliar German transmission, call sign KST-7. You are the Hut 8 team. You have to decipher the message using a codebook recovered from a submarine, locate the trial site by making three sources that never copied one another converge, and work out which of the five people on file is feeding the enemy. Denniston has left a standing order: transmit no conclusion through the normal liaison channel until that channel has been cleared.

What's included

  • ✓The Ultra briefing: what Denniston asks of you, and the channel he tells you to avoid
  • ✓Ten exhibits to print: the intercept, a recovered codebook page, MI5 files, a map, an aerial print
  • ✓Your working sheets: deciphering sheet, suspect table, report of conclusions
  • ✓Four levels of hints online, from a simple reminder to an intermediate conclusion
  • ✓One week of portal access, counted from your first opening, not from the purchase
  • ✓The full solution online, which opens once you have named the mole

Real deciphering, not decoration: the substitution table, the row with no mirror and the spiral reading are solved with a pencil, and the result checks itself. The solution is not in the PDF: it lives on a portal that your code opens, and nobody can stumble on it while leafing through.

How it works

01

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02

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03

Investigate together

1 to 7 investigators around the table. Examine, decode, solve.

WWII / Espionage

The Enigma Code

14 March 1943, Bletchley Park. An intercepted message, an experimental weapon, a mole inside Ultra.

1 to 7 investigators·2 hours·Difficulty ★★★★★
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