The Great Network is a place of drones and androids, maintenance spiders and Station Angels. The place of the thousand gates, where sentient trains criss-cross the galaxy in a heartbeat. Zen Starling is a petty thief from Thunder City. So when mysterious stranger Raven sends Zen on a mission to infiltrate the Emperor's train, he jumps at the chance to cross the galaxy in a heartbeat. But the Great Network is a dangerous place...