- Digital Fortress (1998), Dan Brown's first novel, explores the secret world of the National Security Agency. The title refers to an unbreakable code that former programmer Ensei Tankado uses to paralyze TRNSLTR, a computer used to monitor private terrorist communications.
- Professor Robert Langdon makes his first appearance in Dan Brown's second novel, Angels and Demons (2000). Already a famous symbologist, Langdon is recruited to interpret a symbol that has been branded on a murdered scientist. As the novel progresses, he is called to interpret further murder scenes and comes to discover the symbols that connect them are all related to a group known as the Illuminati, an ancient secret society formed in opposition against the Catholic Church.
- Brown's third novel, Deception Point (2001), is a political thriller that begins with the NASA discovery of an.....
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