In Heirs to Forgotten Kingdoms, former diplomat Gerard Russell ventures to the distant, nearly impassable regions where these mysterious religions still cling to survival. He lives alongside the Mandaeans and Ezidis of Iraq, the Zoroastrians of Iran, the Copts of Egypt, and others. He learns their histories, participates in their rituals, and comes to understand the threats to their communities. As more and more of their youth flee to the West in search of safety and prosperity, these religions face the dire possibility of extinction.