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 and beautiful mathematician. What she uncovers sends shock waves through the corridors of power. The NSA is being held hostage...not by guns or bombs, but by a code so ingeniously complex that if released it would cripple U.S. intelligence.

Caught in an accelerating tempest of secrecy and lies, Susan Fletcher battles to save the agency she believes in. Betrayed on all sides, she finds herself fighting not only for her country but for her life, and in the end, for the life of the man she loves. [Text from back cover]

Released at the Dutch New Year's Meeting in Café Zwart Wit in Eindhoven.

This book has been released as part of the following BookCrossing challenges:
- The Ultimate Challenge - read and release books, with extra points for a monthly theme
- Reduce Mount TBR (To Be Read) - read and release books on the TBR list since before the end of 2016.
- 1001 Books You Must Read Before You Die Challenge. 2017 goal: 12.

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I took the book home from the very nice meeting in ZwartWit. It's going to find a place in my little libary soon.

Om wat ruimte te maken op mijnboekenplanken en een koude zondag middag aangenaam door te brengen , breng ik vanmiddag een bezoekje aan verschillende minibieb's in Eindhoven om wat boeken achter te laten. Veel leesplezier voor de vinder!