Dan Brown wrote the 2003 novel The Da Vinci Code, whose conspiracy plot centers on the Holy Grail.
The novel follows Robert Langdon, a Harvard professor of symbology, after a murder at the Louvre draws him into a mystery involving Leonardo da Vinci’s works, secret societies, and Christian history. Brown combines an art thriller with fictional interpretations of religious and historical traditions.
In the book, the “Grail” is treated primarily as a symbolic secret connected to Mary Magdalene and the alleged bloodline of Jesus. This differs from the traditional medieval image of the Grail as a sacred vessel. The distinction is important because the novel deliberately reinterprets a familiar legend rather than simply retelling Arthurian romances.
The Da Vinci Code became an international bestseller and was adapted into a 2006 film starring Tom Hanks as Langdon. Its historical claims generated widespread debate, but the work is a fictional thriller.