ISBN-13: 9780552161251 / Angielski / Miękka / 2009 / 528 str.
ISBN-13: 9780552161251 / Angielski / Miękka / 2009 / 528 str.
When the National Security Agency's invincible code-breaking machine encounters a mysterious code it cannot break, the agency calls in its head cryptographer, Susan Fletcher, a mathematician. Caught in an accelerating tempest of secrecy and lies, Fletcher battles to save the agency she believes in.