| All | In Stock | |||
| All | Cassette | CD | Mp3 - CD | |
| All | Abridged | Unabridged |
When the NSA's invincible code-breaking machine encounters a mysterious code it cannot break, the agency calls its head cryptographer, Susan Fletcher, a brilliant mathematician. What she uncovers sends shock waves throughout the corridors of power. Abridged. 5 CDs.