In the year 2030, set in Milan, Diana Cavalieri operates as a double agent for the covert organization known as Citadel. Her mission involves penetrating Manticore, the competing agency responsible for Citadel’s downfall eight years prior. While caught in hostile territory, Diana faces an opportunity to abandon the agency for good. However, she must choose whether to place her trust in an unexpected ally: Edo Zani, the successor of Manticore Italy.