Robert Langdon Returns In Dan Brown's Brilliant New Thriller, The Secret Of Secrets, Available Now.discover The Bestselling Thriller Of All Time From Global Phenomenon Dan Brown.harvard Professor Robert Langdon Receives An Urgent Late-night Phone Call While On Business In Paris: The Elderly Curator Of The Louvre Has Been Brutally Murdered Inside The Museum. Alongside The Body, Police Have Found A Series Of Baffling Codes.as Langdon And A Gifted French Cryptologist, Sophie Neveu, Begin To Sort Through The Bizarre Riddles, They Are Stunned To Find A Trail That Leads To The Works Of Leonardo Da Vinci - And Suggests The Answer To A Mystery That Stretches Deep Into The Vault Of History.unless Langdon And Neveu Can Decipher The Labyrinthine Code And Quickly Assemble The Pieces Of The Puzzle, A Stunning Historical Truth Will Be Lost Forever.