Years after the imprisonment of Leviathan’s leadership, a deadly virus known as Necrothorn spreads across the United States, infecting thousands. Amid the growing crisis, former Steelborne Wolves soldier Jeremiah Mercer leads the North Carolina Liberation Front, formerly known as the Iron Covenant, into a violent rebellion against General Sam Irons and the United States Military Response Authority. When Lieutenant Colonel Eve Torres and the Steelborne Wolves discover that Astra Lockheart, the daughter of Captain Silas Graves, carries the key to developing a cure, they race to deliver her to the Phoenix Coalition in New York before the outbreak spirals out of control. But even as the nation struggles to recover, new threats emerge. A rogue artificial intelligence known as Black Dominion threatens global destruction, while Russian terrorist Gregor Malikov and his Helios Reclamation Front seek revenge for the downfall of Stalin and Leviathan, pushing the world toward another devastating conflict.