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 brilliant, beautiful mathematician. What she uncovers sends shock waves through the corridors of power.
A New York Times 2016 Notable Book Entertainment Weekly's #1 Book of the Year A Washington Post 2016 Notable Book A Slate Top Ten Book "Nathan Hill is a maestro." -John Irving It's 2011, and Samuel...