Når NSAs uovervinnelige supercomputer stilles overfor en mystisk kode den ikke klarer å knekke, blir sjefskryptograf Susan Fletcher tilkalt. Det hun avdekker, sender sjokkbølger gjennom maktens korrid `A new master of smart thrills' People magazine Susan Fletcher has been summoned to the one of the world's most secretive organisations, the National Security Agency. Their unbeatable code-breaking machine has been hacked. Susan is supposed to be able to help. But instead she uncovers the truth. They are being held hostage. Can she protect her country from the most deadly of enemies?
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