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The Mystery of the Fatal Cipher
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The Mystery of the Fatal Cipher

Jacques Futrelle

1907
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A prominent inventor and scientist commits suicide, leaving behind a mysterious letter written in cipher. His adoptive daughter turns to a brilliant detective for help in uncovering the letter's secrets.

Source: مؤسسة هنداوي · Hindawi / Safahat · CC BY 4.0; Arabic translation licensed; original text Public Domain

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