The Da Vinci Code Conspiracy Dan Brown was in financial trouble in 1999. His first two science fiction novels did not sell, so he switched to writing about Christianity. Angels & Demons, published in 2000, introduces Robert Langdon, but it was a failure. In 2001, Dan Brown sent a synopsis to a New York City agent. The plot is identical to Jack Dunn's 1997 novel The Vatican Boys. The Da Vinci Code, featuring Robert Langdon, was published in 2003. Stephen Hathaway from The Vatican Boys was copied for the role of Robert Langdon. The Vatican Boys Opus Dei "Fictional Facts" are in The Da Vinci Code as historical FACTS. Jack Dunn filed lawsuits against Dan Brown in the US in 2006 and 2010. He was not successful in obtaining a judgment. However, Dan Brown's evidence to the court cannot be true. The Da Vinci Code incorporates elements of The Holy Blood and the Holy Grail, which was published in 1982. In it, the Priory of Sion protects the "Bloodline" mystery, which claims Jesus Christ married Mary Magdalene and they had children. By 2025, the Priory of Sion is exposed as a hoax. Nonetheless, Dan Brown insists it's a FACT. The book's authors sued Dan Brown in London's High Court of Justice, but the judge ruled against them. However, Dan Brown hid evidence from his court. The Da Vinci Code is one of the all-time best-sellers. The film made $800 million dollars. The Robert Langdon series has produced more than $3 billion dollars in revenues. The Da Vinci Code is "The Biggest Cover-Up in History."