Upon being arrested, Holt is taken to a temporary holding facility where all arrested criminals are brought for an interrogation, as well as a verdict that decides their fate. Some are executed, and their organs are harvested and sold. The others are taken to high-security prisons and used as labourers or test subjects.Shortly after an interrogation, the holding facility is attacked by corrupted machines, and chaos ensues. A scout bot thats remotely controlled by a mysterious individual calling himself Cai sets Holt free and instructs him to escape. Holt joins forces with a smart scientist Chloe and an assassin Lorelei, both of whom were also imprisoned. Following Cais lead, they flee the facility.However, their ordeal has only started. With no allies, few resources, and government police on their heels, they must find any means to survive and escape this condemned city - a City of Chains.