Burstein Dan, De Keijzer Arne. Secrets of the Lost Symbol

The unauthorized guide to the mystery behind the Da Vinci Code Sequel. - New York: Squibnocket Partners LLC, 2009. - 234 p.
The book follows the same format as the earlier books in the Secrets series,
Secrets of the Code, Secrets of Angels & Demons, and Secrets of Mary Magdalene. It is a comprehensive reader's guide to a fascinating and complex novel 'The Lost Symbol'.
Once again, the authors have gathered a wide range of world-class historians, theologians, scientists, philosophers, symbologists, code breakers, art historians, experts on the occult, and writers and thinkers of all types who give readers the essential tools to understand 'The Lost Symbol'.