In the far-flung future, the lifeblood of the United Star System is its postal service, responsible for delivering correspondence and resources between the far corners of the galaxy. The United Star System Postal Service prides itself on expedient deliveries and the best customer service around. Postal carrier 131-C, callsign Silverfish, is no different in that regard. When assigned to galactic route 222, Captain Horris, pilot Roddy, and engineers Basah and Fives expect a postal run like any other.
All expectations of a standard run shatter when they discover their latest oversized package is actually a stowaway: a soldier named Perseus, fleeing the war that has consumed his planet and people. Despite his flagrant breach of postal code, the Silverfish crew agree to deliver Perseus to his destination. But Perseus is more important to the war effort than he has let on, and there is a growing hunt for the AWOL soldier. As multiple factions descend on the Silverfish, her crew will have to outwit and outrun certain death...all while ensuring peak customer satisfaction.