A brilliant government codebreaker is found dead inside a locked London study. The door is bolted from within, the windows are sealed, and beside her lies a mysterious sequence of numbers that may hold the key to everything.

As Hercule Poirot begins to unravel the impossible crime, the trail leads beyond an ordinary murder—to secret intelligence, hidden loyalties, betrayal, and a dangerous conspiracy reaching into the shadows of Whitehall.

But in a case built on codes and deception, even death may not be exactly what it seems...

Enter a fog-covered 1930s London mystery filled with secret messages, locked-room intrigue, espionage, betrayal, and the brilliant deductions of Hercule Poirot.

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Disclaimer:
This is an unofficial, fan-created fictional story produced solely for entertainment. It is inspired by the traditions and atmosphere of classic detective fiction. Hercule Poirot and other established elements associated with the original works belong to their respective rights holders. This channel is not affiliated with, endorsed by, or officially connected to the Agatha Christie estate or any associated copyright holders. No ownership of established characters is claimed.