The seeds of mutiny are growing... The northernmost outpost of the eastern flank has gone dark. Captain Steele and the commanders of Operation Homefront shift forces north to discover what happened to the Marines stationed there. But, all is not right at Camp Forge. An outbreak of debilitating illness ravages through the base, forcing Gwen on a journey through Iowa to find medicine to treat the sick, including her niece. Meanwhile, the tension is building between the various factions holding the line against the dead. The dead are gathering across the Mississippi River, waiting for their chance to overrun the thin, divided front and finish off the battered remains of America.