Forty-four years ago, as any schoolgirl can tell you, the moth's eggs hatched and an army of caterpillars spread their tiny toxic threads on every breath of wind. Since then, men have been cloistered, protected from birth against the deadly poison.

But now there's a vaccine - a way that men can leave the facility without dying or suffering from psychosis. Emerging, into their new world, eyes wide with wonder at every new experience, the truth soon becomes clear.

This world was not made for men. And they are not safe.