The time is the distant future. Earth has been rendered uninhabitable by
terrible storms during which its only city, Center, constructed around a
natural cave system, is sealed from the outside. Mischa, a young thief
whose capabilities are enhanced by hereditary mutation, is trying to
escape with her drug addicted brother from the dominance of her uncle.
When a starship arrives, commanded by the twin alien pseudo-sibs, Subone
& Subtwo, Mischa seizes her chance. All goes well until Subone, in a
moment of cruelty, lures Mischa's brother into a fight, killing him.
Mischa exacts her revenge, but then has to flee the wrath of the aliens
and take refuge back in the deep caves underneath the city.