The Flock is set in a post apocalyptic Britain some eight years after the event now known as The Fall. Mankind has all but been wiped out, and those that remain are still at risk. Wild animals, either escaped from wildlife parks or domestic pets turned feral, wander the countryside at will. Those that created safe havens, called Townships, are at daily risk of attack by gangs of bandits, who roam from district to district in search of easy prey.
It's against this backdrop that we find Abel, an ex Army medic, on a scavenging run in a derelict factory. Crossing paths with another traveller, Malcolm, exposes the conflict between two opposing ideologies.
Hard on Abel's trail is his girlfriend, Isabel, and surrogate daughter, Vera. In tracking Abel down, they discover what could be the second apocalypse.