Every year, thousands of pilgrims travel the ancient pilgrimage route to Spain's Camino de Santiago de Compostela. The sacred journey ends with a visit to the shrine that is believed to hold the bones of Saint James the Great – Apostle of Jesus. But new research and discoveries suggest that the Camino might have been a sacred pathway long before the Christian age and that the bones in the sacred shrine may not belong to James after all. Instead, they might be the remains of a controversial heretic seen as a threat to the very existence of the Christian church.