A mystery series based on Dan Brown's Robert Langdon novels is in the works at Netflix. "Netflix has greenlit a Robert Langdon series based on The Secret of Secrets by Dan Brown!" Penguin Books, Brown's publisher,

Netflix is adapting 'The Secret of Secrets,' Dan Brown's upcoming 'Robert Langdon' mystery novel. Carlton Cuse serves as showrunner.

In a major bidding waramong the streamers, Netflix has landed the upcoming series adaptation of The Secret of Secrets , from author Dan Brown and showrunner Carlton Cuse ( Lost, Jack Ryan, Locke and Key ).