Duke Starn co-owns the interstellar courier service TWD Express alongside partners Ken Katô and Ivan Sarnikoff. The company, specializing in cargo transport across star systems, grapples with persistent financial troubles. This forces the trio to accept high-risk assignments from larger entities like Olympia Transportation.

During a critical mission, Duke and his partners purchase a vessel for transport, only to later discover it conceals an advanced battle spaceship. Unaware of its military capabilities at acquisition, they proceed to take on a perilous assignment: protecting a shapeshifting Hydra entity. This being manifests in human form as a woman named Lina, and Duke actively participates in safeguarding her from hostile forces hunting her through space.

As a key member of the TWD Express crew, Duke navigates the dangers arising both from their accidental possession of the battle spacecraft and their commitment to Lina's safety. Mission operations involve collaborative decision-making with Ken and Ivan.