Sergeant Marcus Fenix finally returns home to a planet at peace—only for the ground to split open after 79 years of war. A subterranean army called the Locust Horde erupts across the world, killing billions. Marcus loses his best friend Dom Santiago’s entire family in the attack, including Dom’s wife Maria. Forced to retreat to the last human stronghold of Jacinto, Marcus must confront his estranged father Adam, a scientist who secretly knows the Locust come from the Hollow—and that he sent Marcus’s mother there to die. When Adam is trapped underground, Marcus disobeys orders to rescue him, leading to a final stand where the Hammer of Dawn rains fire from the sky. Adam dies in Marcus’s arms, having finally said he’s sorry. But as Marcus is marched to prison for his defiance, General Raam watches from the shadows. The war has only begun.