In the 25th century over a million people left Earth to settle planets around other suns.

As the colonies flurished and more were settled optimizm abounded despite the hard ships. Then came the mad scientists whose meddling resulted in the first inter stellar war (Mutiny on the Omaha).

A robot killer ship sent out at the end of the war finds and attacks and an unregistered planet (Ghost Planet). Then hides on the inner moon.