In a modern megacity where cults conduct wars behind permits and prayers, Incarnations—angels and demons dropped like living warheads—erase neighborhoods in seconds. When the Order of the Pyre unleashes Khal-Zhaur, a god who has harvested souls for 220 years, demon-tamer Elias Brand wagers his body, his faith, and his city on an impossible marriage: bind the fire, exile the god, and end the ledger of ash. Invocation of the Fire God is terror, suspense, and survival—an urban apocalypse fought with names, thresholds, and the courage to become a gate.