With a price on their heads, and with former Commonwealth soldiers looking for them, Aaron and his crew head out to the Rim; the true edge of civilization.

Cargoes are scarce but Aaron and his crew scrape by. When they have a cargo canceled, they take a charter to transport a core-worlds doctor and his assistants. The doctor wishes to do research in the uncharted territories and he wants Aaron to take him there.

Unbeknownst to Aaron, the doctor's research has come to the attention of a core-worlds intelligence agency, and they are hot on his trail.