Coming of age story about a girl who's turning into a monster - literally
After terrible epidemics fifteen years earlier, Britain has been left in "post-war" poverty. The country is run by the Purity trying to eradicate "S.I.D", a retro-virus that turns people into monsters that die in agony and insane.
Chloe Dark, 16, wants to make life better, defeats the school bully using Jujitsu. She works with Miss Kepple, the school Purity teacher, so she can join the Purity herself. Then her friend Melinda disappears, like two other teenagers before her.