The Codex Gigas, also known as the Devil's Bible, is a giant medieval tome that has evoked fear for centuries and believed to contain a malevolent power; now, experts investigate to reveal its legendary secrets and uncover the mystery behind its author.The Codex Gigas, also known as the Devil's Bible, is a giant medieval tome that has evoked fear for centuries and believed to contain a malevolent power; now, experts investigate to reveal its legendary secrets and uncover the mystery behind its author.