Dan Brown is the bestselling author of the Robert Langdon thriller series, including The Da Vinci Code, Angels & Demons, The Lost Symbol, Inferno, and Origin. His novels have sold 250 million copies worldwide. Brown’s work has defined a modern genre of high-concept, research-driven thrillers that fuse art, history, religion, and science, and several of his books have been adapted into major feature films. His latest book, The Secret of Secrets, released in September 2025, returns to the Robert Langdon character in a new contemporary thriller. ------ Thank you to the sponsors that fuel our podcast and our team: Squarespace https://squarespace.com/tetra Use code 'TETRA' ------ LMNT Electrolytes https://drinklmnt.com/tetra Use code 'TETRA' ------ Athletic Nicotine https://www.athleticnicotine.com/tetra Use code 'TETRA' ------ Sign up to receive Tetragrammaton Transmissions https://www.tetragrammaton.com/join-newsletter