When an invading alien force called the Roxis establishes a stranglehold across Saturn's ten moons, Earth's military lies in ruins. The only figure willing—or reckless enough—to mount a counteroffensive is Luke Snayles, a disgraced pilot and convicted criminal whose instability might be humanity's greatest asset. Piloting a modest spacecraft with minimal resources, Snayles must systematically assault each moon's fortifications, growing stronger through scavenged equipment while confronting increasingly formidable enemies and weaponry. As he carves a path from Janus onward, warp gates unlock passage to each successive target, offering him slim chances at survival but perhaps Earth's only chance at redemption.