This horrifying thriller, partly based on a true story, is the scariest novel yet from an international bestseller.
The crunching noise had resumed, now accompanied by a disgusting, indefinable smell. It could best be described as a...
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, beautiful mathematician. What she uncovers sends shock waves through the corridors...