Humans live throughout the solar system but the factories on Earth stopped producing. No new ships, no new stations. Find an old ship to salvage? Someone died there. Maybe many someones.
April knows this better than anyone. She cleanses haunted spaces, removes ghosts left behind by hull breaches, failure of a life support system, or even good old-fashioned cabin fever.
People rely on her for peace of mind, living in ships with such histories. She wants to help. She believes in family and in people lending a hand when called on.
But in ghosts? Not so much. When nothing saves you from the killing vacuum of space but the thickness of your hull, why make up other horrors. Or so April thinks, until she answers one last call for help.