Bex Atria is many things. Violent. Human. Mercenary. She is one of two billion sapient beings living aboard Hegira, a wandering world of horror and boundless beauty. Bex has lived in the slums of Hegira all her life. She's done it all. She's seen it all. Nothing can surprise her. Sumida is everything Bex isn't. She is soft-spoken. Inhuman. Sheltered. She's about to turn Bex's world upside down.