The chronological order of Dan Brown's books is "Digital Fortress" (published in 1998), "Angels And Demons" (2000), "Deception Point" (2001), "The Da Vinci Code" (2003) and "The Lost Symbol" (2009). His most recent book, "Inferno," was published in 2013.
"Digital Fortress" involves betrayal, the National Security Agency and a mysterious, complex code that would cripple the U.S. intelligence community if released. "Deception Point" continues the NSA theme but employs a different heroine and expands the deception to include a masterful ploy, scientific trickery and imminent consequences for the entire world.
"Angels and Demons," "The Da Vinci Code," "The Lost Symbol" and "Inferno" make up the Robert Langdon series. In "Angels and Demons," symbologist Robert Langdon undertakes an assignment involving the Roman Catholic Church and a secret organization, known as the Illuminati. "The Da Vinci Code" became renowned for its bizarre riddles and alleged clues hidden in the works of Leonardo Da Vinci and supposedly connected to another secret society, the Priory of Sion. The clandestine world of the Masons is featured in "The Lost Symbol," set within the hidden chambers and tunnels in Washington D.C. Dan Brown's fourth Robert Langdon novel sends the protagonist to Italy where he encounters a formidable adversary and enters the dark world of Dante's epic poem, "Inferno."