The Secret of Secrets Book Review: Dan Brown’s Thrilling Return to Prague

The Secret of Secrets Book Review

After an eight-year break, Dan Brown is back—and so is everyone’s favorite symbologist (or at least my favorite symbologist), Robert Langdon. The Secret of Secrets, released in 2025, is the sixth novel in Brown’s bestselling series that began with Angels & Demons and exploded with The Da Vinci Code. (If you’re new to the series, check out my overview of the Robert Langdon series for information on all six novels and movies.)

Brown begins with a familiar claim: “All artwork, artifacts, symbols, and documents … are real.” It’s a signal: we’re diving back into his signature mix of history, neuroscience, religion, and hidden truths.

When Langdon awakens in Prague beside Dr. Katherine Solomon (yes, from The Lost Symbol), he quickly finds himself thrust into a desperate race—decode an ancient text, stop a conspiracy, and bridge science with the divine. The result? A thrilling return, with new ambition and more introspection than many past installments.

As someone who has read all of the books (more than once!), I know a thing or two about this series, so keep reading for my book review for The Secret of Secrets.

Key Locations

Somewhat obviously, one of the reasons I love Dan Brown’s books is his ability to bring the setting to the forefront and make it a main character. You learn so much about each setting through his writing. This story unfolds primarily in Prague, a city described as “enchanted…a moment frozen in time.”

Langdon’s investigation takes him through some of the city’s most striking landmarks, all vividly described and perfect for literary travelers because they’re all places you can visit in real life:

• The Charles Bridge, setting for one of the first mysterious scenes
• St. Vitus Cathedral and Prague Castle’s Vladislav Hall, where the mystery first deepens
• The Klementinum, home to a stunning Baroque library and astronomical tower
• The Four Seasons Hotel (including the CottoCrudo bar where Langdon and Solomon fist meet Dr. Gessner)
• Old Town Square with the imposing Clock Tower
• The US Embassy in the Schönborn Palace
• Petschek Villa, the home of the US Ambassador since 1945 (also called Le Petit Versailles)
• Crucifix Bastion, a fort from the 14th century that houses a secret laboratory in the novel
• Hidden bars and modern haunts like Black Angel’s Bar, Hemingway Bar, and Anonymous Bar—locations readers can actually visit
• The CODA Restaurant, one with a great rooftop terrace…and whose name means “code” in Czech
• The eerie Sedlec Ossuary (Bone Church) and the mysterious Church of St. Lawrence
• Vltava River, the longest river in the Czech Republic that runs under the famous Charles Bridge and connects many of the book’s locations
• And a somewhat surprising alternate story location in New York City’s Random House Tower

Brown’s meticulous research into the sites of Prague (there’s even a map of Prague included in the book) makes this a perfect choice for travelers who love to retrace fictional footsteps. It’s a novel that can double as a literary travel guide, complete with cobblestones, candlelight, and absinthe.

Main Characters

Alongside Langdon, The Secret of Secrets features a familiar yet refreshing mix of good guys and bad guys and sometimes you’re unsure which side a character is actually on:

• Dr. Katherine Solomon, the brilliant noetic scientist who is now Langdon’s romantic partner, but also whose research is the basis of this story.
• Dr. Brigita Gessner, a neuroscientist whose research into epilepsy and “out-of-body” experiences leads to unexpected ethical questions.
• The Golem, a shadowy villain with an unknown background.
• Captain Oldřich Janáček, from the Czech intelligence service.
• Mr. Everett Finch, an American in London, though his role is unclear for much of the story
• Sasha Vesna, Dr. Gessner’s assistant/patient with epilepsy
• Ambassador Heidi Nagel, a strong female character trying to balance her many life roles and relationships
• Jonas Faukman, Langdon’s publisher and returning comic relief—yes, he still works for Random House and still finds ways to get entangled in Langdon’s chaos.

Supporting players—from embassy staff to intelligence officers—keep the pace brisk, though as always, it’s Langdon that keeps the story going.

Themes & Impressions

Like Origin before it, The Secret of Secrets is centered around religion, science, technology, and the power of human consciousness. Brown explores whether the “divine” might be measurable, if memory can transcend death, and how technology shapes what we perceive as truth.

As usual, there is also a deep discussion on art and symbolism, from Prague’s avant-garde installations to the ancient Enochian language. Langdon’s decoding of these visual clues ties modern neuroscience to mystical traditions, blurring fact and faith in classic Dan Brown fashion.

While the pacing is just as fast as the others in the series, this book feels a little more introspective than previous installments. Langdon—older, slightly more vulnerable, and now in a romantic relationship—reflects on what it means to pursue meaning in an age of artificial intelligence and instant information. Katherine’s presence adds warmth and heart, grounding the novel’s heady concepts in genuine human connection.

I’ll be honest: some of the scientific passages (like the ones on remote viewing, lucid dreaming, and noetic resonance) were quite dense and I had a hard time following—especially in audio format. But, it is good to have the book follow Robert Langdon themes, but not completely repetitive and falling back into the familiar Vatican conspiracies.

And of course, the book has the other fun things we love about the series: cryptic clues, random facts, architectural details, historical flashbacks, and puzzles to solve.

(With so much to talk about, The Secret of Secrets would make for a great book club discussion. Be sure to check out my The Secret of Secrets book club guide for suggested questions and some fun activities to make the discussion even more memorable.)

Final Thoughts

The Secret of Secrets is a return and a bit of a reinvention. It gives Robert Langdon a more introspective, thoughtful story while still offering the globe-trotting, code-breaking thrill ride fans expect.

By centering the story in Prague, one of Europe’s most atmospheric and myth-rich cities, Brown gives Langdon new life and readers new reasons to explore. The novel’s focus on human consciousness also feels timely, inviting us to question where science ends and spirituality begins.

Is it Brown’s best book? Probably not. But is it worth reading? Absolutely—especially if you’ve followed Langdon’s journey from the Vatican to Harvard to the Charles Bridge.

There isn’t a movie yet for this one (see my overview of the other Robert Langdon movies), but my guess is that one will be coming in the future…