It has been twenty-eight days since Jim, a young bicycle courier, was knocked off his bike and injured in a car accident.
When he wakes up from his coma, the world has changed. London is deserted, litter-strewn and grim, and it seems the entire world has disappeared.
The truth, however, is even more horrifying - a devestating psychological virus has been unleashed on the world, turning the population into blood-crazed psychopaths driven only to kill and destroy the uninfected.
A bitter struggle to get out of the city with fellow survivors to a military encampment at Manchester follows - but there, their troubles are just beginning...