As cannibalistic zombies ravage their way through city streets, London faces a catastrophe that is unparalleled. Zac Tennyson unwittingly finds himself thrust into the middle of an apocalyptic nightmare, where the population have been distorted into monstrous, relentless creatures. Unaffected by pain or remorse, they swarm through the streets in flesh hungry packs, hell bent on hunting down the scattered remnants of the population. Will he escape the dead city?