Dan Brown’s 2003 best-selling detective novel The Da Vinci Code and its blockbuster spinoff sparked an evangelical conversation about Gnosticism, or esoteric theology, a Christian heresy known for its revisionary approach to biblical history. In the novel, a symbologist investigates a murder in the Paris Louvre Museum and uncovers evidence of a marriage between Jesus and Mary Magdalene. The book initiated debate about the validity of extra-biblical theology and blurred the line between fiction and theological scholarship.