Digital Fortress

In Dan Brown's gripping thriller, Digital Fortress, the National Security Agency confronts a cryptic code that even its advanced code-breaking machine cannot decipher. Head cryptographer Susan Fletcher, a talented mathematician, is summoned to unravel the mystery, only to discover a conspiracy that puts national security at risk. As she navigates a tangled web of secrecy and betrayal, Fletcher must fight to protect both her agency and her life from an unprecedented threat that could alter the balance of global power forever.