Dan Brown Announces New Novel 'The Secret of Secrets' Set for September Release

The latest Robert Langdon thriller explores cutting-edge science and ancient mysticism across Prague, London, and New York.

Dan Brown's new book, 'The Secret of Secrets,' will be published on September 9, 2025, and is available for preorder now.
The novel follows Harvard symbologist Robert Langdon as he investigates the disappearance of his girlfriend, Katherine Solomon, a noetic scientist.
Set in Prague, London, and New York, the story combines futuristic science, mystical lore, and a secret project that challenges current understanding of human consciousness.
The book features a powerful organization, a chilling assailant tied to Prague's mythology, and a race to uncover shocking revelations about the mind.
Brown has described this as his most ambitious novel yet, blending his signature focus on codes, art, history, religion, and science.