Drunk demonologist John Constantine is forced out of London to protect the young Rachel Roth, a girl who serves as a portal to free the demon Trigon and stop the Cult of Cold Flame, led by Jaimini Sargon, from using Rachel to bring Trigon home. Earth and destroy all reality as known, which leads to a relentless and sinister chase across New York City, as Sargon possesses the compass of Croyden to find Rachel.
In a Post-Credits scene, Constantine visits his old friend Alec Holland, the Swamp Thing.
