Author’s Note

‘It looks as if Bletchley Park is the single greatest achievement of Britain during 1939-45, perhaps during this century as a whole.’

George Steiner

‘A mathematical proof should resemble a simple and clear-cut constellation, not a scattered cluster in the Milky Way. A chess problem also has unexpectedness, and a certain economy; it is essential that the moves should be surprising, and that every piece on the board should play its part.’

G.H. Hardy, A Mathematician’s Apology

This novel is set against the background of an actual historical event. The German naval signals quoted in the text are all authentic. The characters, however, are entirely fictional.

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