The Da Vinci Code claims that "the greatest cover-up in human history" is that not only did Jesus marry Mary Magdalene, but they had a daughter, named Sarah, whose descendants live today through the Merovingian line of French royalty in the Plantard and Saint-Clair families.
These claims come from the writings of Pierre Plantard, who spent time in Jail for fraud in 1953, and in 1993 admitted under oath that he made up the whole story. (See Lee Strobel and Garry Poole, Discussing the Da Vinci Code, p. 23)
Hmmm. So who is the real fraud?