When an unknown virus is unleashed on London, it turns everyone in its path into violent, zombie-like killing machines, leaving their souls separated and floating away to form a giant halo above the capital. Flesh and spirit, dead and alive, they are both. They are severed.

As a beleaguered government brings in scientists to work on an antidote, the problems become even more complex. The virus spreads. The mayhem grows. There's no solution in sight and time is running out.

Enter Stephen Hobbs, a hard-drinking, womanizing academic with a violent past of his own. Due to his special skill set and experience, he is enlisted to figure out what the virus is and how to stop it. Despite his own demons, Hobbs may very well be humanity's last chance to survive becoming…SEVERED.