The Imperium is locked into a gruelling war of attrition for the fate of Vesperus during the Sabbat Worlds Crusade — a dead hive on the planet Lysander nicknamed 'Interceptor City'. Former ace fighter pilot Bree Jagdea is forced to give up her relatively safe life of supply runs, and is enlisted in the infamous Circus 66 squadron, whose contributions to the war effort are far more dangerous. In Vesperus' lethal rat runs, the smallest error means certain death – the only question is whether Bree can make it through this hellish gauntlet alive.[1]