After his father is found dead, computer analyst Nathan Grey becomes the target of a group of murderous machines called the Bloc. After being nearly killed by one of them, Nathan is rescued by a member of the League of Allied Worlds, a secret organization consisting of humans and aliens. After being recruited into the League, Nathan learns that his father was also a member, and that his death is linked to the Bloc and his work with the League.
After exploring a series of recently discovered portals leading to other worlds, Nathan Grey and members of the League of Allied Worlds uncover evidence linking the mysterious past of Nathan's late father to an ancient alien ship buried under the city of Tabula Rasa. From there Nathan and the crew of the LAW Morning Star are led to the hidden planet of Adaria. There they encounter a small group of inhabitants who claim to be descendants of a mythical race called the Ancestors.