Before Dan Brown's book The Da Vinci Code, there was Holy Blood, Holy Grail, written by Michael Baigent, Richard Leigh, and Henry Lincoln, that is known for its revelation of the possibility of a sacred bloodline continued by Jesus and Mary Magdalene. It was their research on which Brown based much of his novel. Now, 30-some years since they wrote their last follow-ups, Henry Lincoln continues to investigate the source of the story. In this special, the man who launched the whole story breaks his silence, allowing viewers to unlock his secrets and addressing critics who say the whole thing is a hoax. We also explore the connection to the Knights Templar.