In London, after a worldwide sickness infects adults, turning them into zombie-like creatures, DogNut and his crew embark on a deadly mission to find missing friends, as hungry, bloodthirsty grownups lie in wait.

Ella is out in the country, alone now except for her silent rescuer, Scarface, about whom she knows nothing, while Ed leaves London on a dangerous quest, determined to find Ella and keep his promise to Small Sam that he will reunite sister and brother.

"The final battle ensues between Saint George's army of sickos and the army of London kids"--

"First the sickness rotted the adults' minds. Then their bodies. Now they stalk the streets of London, hunting human flesh. The Holloway crew are survivors. They've fought their way across the city and made it to the Natural History Museum alive--just barely. But their fight will never end while the Enemy lives, unless there's another way... The kids at the museum are looking for a cure. All they need are medical supplies. To get them they must venture...