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 has ordered a series adaptation of "The Secret of Secrets," the upcoming sixth installation in novelist Dan Brown's "Robert Langon" mystery series. Brown serves as co-creator of the series alongside Carlton Cuse,

In a spirited bidding war, Netflix has landed The Secret of Secrets, based on Dan Brown's novel, from showrunner Carlton Cuse, with a series order.