ISBN-13: 9780552159739 / Angielski / Miękka / 2009 / 512 str.
ISBN-13: 9780552159739 / Angielski / Miękka / 2009 / 512 str.
When the National Security Agency's code-breaking machine encounters a code it cannot decipher, the agency calls in Susan Fletcher, its head cryptographer. She discovers that the agency is being held to ransom with a code so complex that, if it was released, it would cripple U.S. intelligence.