The humans of Sera, after decades of war over the fuel Imulsion, face annihilation on Emergence Day when the Locust Horde—a savage subterranean army—erupts from below. Sergeant Marcus Fenix, a scarred and grim soldier, fights alongside his best friend Dom Santiago to defend humanity's last stronghold, Jacinto. As Dom is shattered by the loss of his family, Marcus must confront his estranged father, Adam Fenix, the genius whose past work may hold the key to a devastating counterattack. With the elite Delta Squad at his side, Marcus descends into the Hollow to retrieve a weapon that can turn the tide, leading to a desperate final stand where humanity's survival hinges on a son's forgiveness and a father's ultimate sacrifice.
