The Da Vinci Code author Dan Brown shares the next beat of the protagonist and Harvard symbologist Robert Langdon’s story. The Author said, “THE SECRET OF SECRETS is by far the most intricately plotted and ambitious novel I’ve written to date – and also the most fun. Writing it has been an unforgettable journey of discovery.” This book comes out this September.

According to a synopsis of the book, Langdon travels to Prague to attend a lecture by his girlfriend, Katherine Solomon, a “prominent noetic scientist” who is set to publish a book that “contains startling discoveries about the nature of human consciousness and threatens to disrupt centuries of established belief.”

However, “a brutal murder catapults the trip into chaos,” and Katherine and her manuscript subsequently disappear. Meanwhile, Langdon “finds himself targeted by a powerful organization and hunted by a chilling assailant sprung from Prague’s most ancient mythology.” The novel sees Langdon travel across London and New York as he searches for Katherine and clues to her disappearance.

“In a thrilling race through the dual worlds of futuristic science and mystical lore, he uncovers a shocking truth about a secret project that will forever change the way we think about the human mind,” the synopsis reads.

Penguin Random House Global CEO Nihar Malaviya says, “Dan Brown has created a new Robert Langdon thriller that will mesmerize and delight readers across the world. The hallmarks of Dan’s books – codes, art, history, religion, and cutting-edge science – are on full display alongside a propulsive plot. And we find one of fiction’s greatest heroes, Robert Langdon, in love and on the run in one of the world’s most mysterious and beautiful cities. THE SECRET OF SECRETS is Dan’s best novel yet, and this will be the biggest publishing event of 2025.”

Brown’s novels have been translated into 56 languages internationally, with over 250 million copies in print. Brown also authorizes numerous #1 bestsellers, including ORIGIN, INFERNO, THE LOST SYMBOL, ANGELS & DEMONS, DECEPTION POINT, and DIGITAL FORTRESS.

The Secret of Secrets: A Novel (Robert Langdon Book 6)
The world’s most celebrated thriller writer returns with his most stunning novel yet—a propulsive, twisty, thought-provoking masterpiece that will entertain readers as only Dan Brown can do.
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Michael Kozlowski is the editor-in-chief at Good e-Reader and has written about audiobooks and e-readers for the past fifteen years. Newspapers and websites such as the CBC, CNET, Engadget, Huffington Post and the New York Times have picked up his articles. He Lives in Vancouver, British Columbia, Canada.