The plot centres on a group of Cockneys who arm themselves to rescue their grandfather and his friends from their retirement home as a zombie apocalypse takes place in the East End of London.

In a building site being developed by Hartman Construction in the East End of London, two builders discover a 1666 catacomb, sealed by order of Charles II.

Elsewhere, Terry MacGuire and his younger brother Andy have planned a bank robbery so they can save their grandfather Ray's retirement home from being demolished.

They recruit their cousin Katy, hopeless Davey Tuppence, and "Mental" Mickey, an unstable Iraq War veteran who has a metal plate in his forehead, and gather a large supply of weapons.

The MacGuires, Katy, Mickey, Davey and their hostages drive through a devastated East End until they reach their safe-house, where they stowed their car earlier.

Emma pleads with Mickey and Davey to let her and Clive go, saying she does not care about their 'selfish' plans, and Katy tells her they are not robbing the bank for themselves, but to save the retirement home.

Mickey, growing more irrational and tired of the friendliness of his fellow bank robbers, decides to leave and takes Emma and Clive with him to a side room where he ties them up, and sits down to rest.

The group pack the money and themselves into Terry's waiting car, intending to travel to the retirement home, but on the way they stop to look for Emma's younger sister.