The Lost Symbol by Dan Brown

Book Preface

My profound thanks to three dear friends with whom I have the great luxury of working: my editor, Jason Kaufman; my agent, Heide Lange; and my counselor, Michael Rudell. In addition, I would like to express my immense gratitude to Doubleday, to my publishers around the world, and, of course, to my readers.

This novel could not have been written without the generous assistance of countless individuals who shared their knowledge and expertise. To all of you, I extend my deep appreciation.