Best Selling Author's New Netflix Adaptation Begins Filming In Prague

Published Sep 4, 2026, 11:01 AM EDT

Adam has been writing in the entertainment news space for over a decade. Beginning his career of covering film and TV at CinemaBlend, he has also appeared on The Flash Podcast and done several radio spots. 

Netflix’s adaptation of bestselling author Dan Brown’s newest novel has begun production in Prague.

In September 2025, Doubleday published Brown's mystery thriller The Secret of Secrets, the sixth entry in his book series revolving around adventuring Harvard symbologist professor Robert Langdon. However, four months earlier, Netflix announced it was already developing a TV adaption of The Secret of Secrets. With cameras now rolling on the project, the streamer has shared a first look and provided new information about this small-screen take on Brown’s novel.

Netflix

Netflix commemorated the start of principal photography by sharing the above behind-the-scenes photo from Prague of lead actors Morgan Spector and Rebecca Hall, who are, respectively, playing Robert and his girlfriend, noetic scientist Katherine Solomon. Additionally, the following recurring actors, and their roles, have been revealed for Netflix’s adaptation of The Secret of Secrets:

• Mamadou Athie as Michael Harris
• Ben Levi Ross as Alex Conan
• Anamaria Marinca as Dr. Gessner
• Richard Sammel as Karl Muller
• Elena Saurel as Susan Housemore

Spector, Hall, and these five recurring actors are joined by previously-announced series regulars Cherry Jones as Heide Nagel, Corey Stoll as Everett Finch, Rob Delaney as Jonas Faukman, and Abbey Lee as Sasha Vesna. Although this is an adaptation of The Secret of Secrets, the show officially remains untitled. Brown is executive producing this show alongside co-creator, showrunner, and writer Carlton Cruse, whose past TV credits include Lost, Jack Ryan, and fellow Netflix series Locke and Key.

Like its source material, Netflix’s version of The Secret of Secrets will follow Robert in Prague as he, per the official longline, “races against ancient forces and time to rescue a missing scientist and her groundbreaking manuscript whose discoveries have the power to forever change humanity’s understanding of the mind.” It’s further stated that the series will “blend futuristic science with mystical lore, delivering on the heart-pounding suspense and international intrigue” from the Robert Langdon books. Emma Forman for Genre Arts and Zoe Robyn are also attached as executive producers.

Robert has previously been played in the cinematic realm by Tom Hanks in 2006’s The Da Vinci Code, 2009’s Angels & Demons, and 2016’s Inferno, all of which were directed by Ron Howard. The three movies were commercial successes, making, in the same order, $801.3 million, $485.9 million, and $220 million worldwide. However, the trilogy was met with primarily negative critical reception.

While The Lost Symbol was skipped over in the film series despite the novel being released before Inferno, Peacock adapted it into a TV show that premiered in September 2021. Silo’s Ashley Zukerman played Robert in this adaptation, and The Boys’ Valorie Curry co-starred as Katherine, who made her first appearance in this story. The TV version of The Lost Symbol earned mixed reactions, and was canceled after season 1. That leaves 2017’s Origin as the sole Robert Langdon book that hasn’t been adapted for film or television.

Netflix’s adaptation of The Secret of Secrets doesn’t have a release window set yet. Along with The Lost Symbol still being available on Peacock, The Da Vinci Code and Angels & Demons can be streamed on Starz, and Inferno is accessible on Prime Video.

Robert Langdon