Love him or hate him, Dan Brown has had an outsized impact on Anglophone pop culture since his breakout novel, The Da Vinci Code (2003) was released 16 years ago. Harvard Professor of Religious Symbology Robert Langdon burst onto the scene like an apres-garde Indiana Jones and gave a generation of readers and filmgoers a slightly dubious lesson in religious history. Since then, things like the Malthusian Tragic (Thomas Robert Malthus—the population growth alarmist who bears a striking philosophical resemblance to Marvel’s Thanos—figures prominently in Da Vinci’s 2013 follow-up, Inferno) and The Gnostic Gospels (a series of Coptic texts that present a portrait of Jesus Christ that diverges sometimes radically from the four canonical gospels) have become (comparatively) common nodes in the cultural consciousness.