Twelve-year-old Alice, an orphan who has never been adopted because of her physical handicap and difficult personality, is shocked to discover she has an identical twin sister living nearby.

Fifteen-year-old Daniel has followed in his parents' footsteps as the Alien Hunter, exterminating beings on The List of Alien Outlaws on Terra Firma, but when he faces his first of the top ten outlaws, the very existence of Earth and another planet are at stake.