Sam Hampton and his wife Rachel have returned to Buxley – the village of Sam's childhood – to decide if they should buy a home in this little piece of English pastoral beauty. They're hoping for a chance to begin their lives and raise a family away from city life and the background threat of rising global tensions. Which is when the missiles detonate.
Now Buxley and the surrounding countryside have become an inferno. Caught in the aftermath of a nuclear blast, Sam and Rachel join with a handful of other survivors desperate to find any semblance of safety. But they are not alone. The raging fires have released entities from the distant reaches of humanity's self-destruction; demons made of shadow which exist only to hunt and reduce to ashes anyone left alive.
Racing through the ruins and the smoke, fleeing the shadow-creatures, Sam and the rest of the group must make their stand to have any chance of staying alive. Prepared to fight, to join together and not leave anyone behind, they will discover that escape is possible but at an unthinkable price.