Sylvia Stryker has no business being on the next Moon Unit Cruise Line, unless you count aspirations and dreams. The career that once felt within her reach-Intergalactic Cruise Ship Security-disappeared the day her dad was arrested for collusion with space pirates. Since then she's begrudgingly been running the ice mine for her aging mother, the two of them social pariahs amongst their fellow Plunians. Everything changes when the uniform lieutenant position on Moon Unit 6 opens up days before departure. Sylvia immediately puts her hacking skills to use, uploading bogus credentials onto the crew manifest. Now to just lay low, do her job, and impress the new boss.

Her plan goes off without a hitch until a non-celestial body falls from the uniform inventory closet after departure. Reporting it means drawing attention, the very opposite of laying low. When the head of security shows up to investigate and throws her into the spaceship holding cell, her onboard status shifts from staff to prisoner. If Sylvia can't expose the killer herself, she'll be bunking with her dad at the local space prison.