The Secret of Secrets — Dan Brown’s New Thriller Arrives September 2025
The wait is almost over! International bestselling author Dan Brown is back with a brand-new Robert Langdon novel. The Secret of Secrets will hit shelves worldwide on September 9, 2025, in hardcover, ebook, and audiobook editions from Penguin Random House. With an announced first printing of 1.5 million copies and simultaneous publication across 17 countries, this is already being called one of the biggest publishing events of the year.
Fans know Brown best from The Da Vinci Code, a global phenomenon translated into 56 languages with more than 250 million copies sold. His thrillers — from Angels & Demons to Inferno and Origin — have cemented Robert Langdon as one of modern fiction’s most iconic heroes. Now, Langdon returns in an adventure that promises all the hallmarks of a Dan Brown novel: history, art, codes, religion, and science — but with higher stakes than ever before.
Brown himself describes The Secret of Secrets as his “most ambitious and intricately plotted novel to date — and also the most fun.” According to Nihar Malaviya, Global CEO of Penguin Random House, the new book will mesmerize readers:
“Langdon finds himself in love, on the run, and caught in a propulsive plot set against one of the world’s most mysterious and beautiful cities. This is Dan’s best novel yet.”
And longtime editor Jason Kaufman agrees:
“The Secret of Secrets unveils a fascinating world filled with ingenious twists. This is classic Dan Brown.”
What’s Inside the Story?
In this high-octane thriller, Robert Langdon, Harvard professor of symbology, travels to Prague for a groundbreaking lecture by Katherine Solomon, a noetic scientist and his new romantic partner. Katherine is about to publish a book that could upend centuries of belief with explosive discoveries about human consciousness. But when a shocking murder shatters the trip and Katherine vanishes — along with her manuscript — Langdon is thrust into a dangerous chase.
Hunted by a terrifying figure pulled straight from Prague’s oldest myths and pursued by a secretive organization, Langdon’s search spirals across London and New York. In a pulse-pounding race through the intersections of futuristic science and mystical lore, he uncovers a revelation about the mind that could change humanity forever.
Whether you’re a longtime Langdon fan or new to Dan Brown’s thrillers, The Secret of Secrets is shaping up to be the most talked-about novel of 2025.
