Long before he introduced the world to Robert Langdon in The Da Vinci Code , Dan Brown released his pulse-pounding debut novel, Digital Fortress , in 1998.

The story follows Susan Neveu, a young and talented cryptanalyst at the National Security Agency (NSA), and John Clay, a computer expert who becomes embroiled in a mystery surrounding a powerful computer system called "Digital Fortress". The system, created by the enigmatic and reclusive programmer Ensei Tankado, has the capability to encrypt and decrypt any piece of information, making it virtually unbreakable. When Tankado dies suddenly, he leaves behind a cryptic poem that leads Susan and John on a thrilling quest to unravel the secrets of Digital Fortress.

While Amazon uses its own proprietary formats (like AZW and KFX), the Kindle app and modern Kindle devices now allow you to easily send and read standard ePub files.

is a name synonymous with high-stakes symbology, religious conspiracies, and page-turning thrillers. While The Da Vinci Code and Angels & Demons often steal the spotlight, many hardcore fans argue that his first novel, Digital Fortress , remains his most technologically prescient and terrifying work.

: You can borrow the EPUB for free using library apps like Libby (by OverDrive) if your local library has it in their collection.