Astra Idari has to keep the last living star alive in a galaxy lost to shadows. Astra Idari is a mess. She drinks too much, remembers too little, and barely pays for it all as a Stargun Messenger. She hunts down thieves who steal filamentium, the fuel that allows for faster-than-light travel. When Idari meets Gen Emera, she meets the girl of her dreams and the last living star. There's just one problem. Filamentium is only found in the blood of living stars. Everyone wields knives and justifications for butchering the living stars to get around, but once Idari knows the truth, she faces a stark choice. Either she turns Emera over to her employers who control the filamentium monopoly, or risks everything to help Emera fulfill her quest to save her people. The choice should be simple, but it's not losing her life that terrifies Idari. It's finally living. Idari knows she's human despite outwardly appearing to be an android with a failing memory stitched together by her ship's irascible AI, CR-UX. She's been just getting by for longer than she remembers, assured in her humanity, but not enough to risk it. Idari has lived her entire life in darkness. The dark comforts and shields. The dark preserves in its cold, and Idari may not be able to keep her star out of her shadow.