Digital Fortress From the Back Cover When the National Security Agencys 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. The NSA is being held hostage  not by guns or bombs, but by a code so complex that if released would cripple U.S. intelligence. Caught in an accelerating tempest of secrecy and lies, 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 				    	 					 About the Author Dan Brown in an American author famous for writing thriller novels with recurring themes of cryptography, conspiracy theories, and symbolism. He is an international bestseller with his novels having been translated into 52 languages. They have sold over 200 million copies worldwide. He has also written a series of novels featuring the character Robert Langdon, two of which have been adapted into films. Some of his famous works include titles such as The Da Vinci Code and Angels And Demons.