Britain is in the grip of wettest autumn ever, and flooding is affecting many parts. When an old virus is dredged up and gets into the drinking water supply, things escalate swiftly. The virus eats off the flesh of its victims in a matter of hours killing 90% of those infected. The remaining 10% are driven mad by the pain of their suffering, having only a primal desire to kill or infect others.

This is the story of five women survivors, trying to escape the floods, the virus, the Infected, as well as fractions inside the group, all while fighting for their very lives.