Sienna has spent her entire life inside the DEZ, a glorified orphanage for the unwanted Marked Kids, but she’s only months away from graduation. In hopes of providing a proper life outside of the cement prison her and best friend Vic grew up in, Sienna began fighting in the Underground. She’s become the arena’s champion — the notorious Blaze — but fighting in the Underground isn’t about the thrill or the glory, though Sienna has achieved both. It’s about the money...and a way out. When an explosion rocks the city of Cytos, the Marked kids find themselves at the center of a brewing war. Sienna risks everything on one last fight, and with time running out failure is not an option. Her opponent, the Wraith, isn’t just a skilled fighter, she’s a Watcher — a trained assassin sworn to protect the citizens of Cytos. But Sienna will soon find out that this isn’t a fight for glory, it’s a battle of survival…and every Marked Kid in the DEZs is the price she’ll pay if she loses.