Ten years after Emergence Day, as the Locust Horde advances on humanity s last defended area Ephyra in a bloody war that has seen billions die, Marcus Fenix does the unthinkable: he defies orders and abandons his post during a critical battle in a bid to rescue his father, weapons scientist Adam Fenix. But Adam is buried in the rubble during a ferocious assault on the Fenix mansion, and Ephyra falls to the enemy. Marcus, grieving for a father everyone believes is dead, is court-martialed for dereliction of duty and sentenced to forty years in the Coalition of Ordered Government s brutal maximum security prison, known simply as the Slab. But Adam is very much alive, snatched from the destruction by the elite Onyx Guard on Chairman Richard Prescott s orders. He s now a long way from home and in a prison of his own a COG doomsday bunker on the tropical island of Azura, a place hidden from the rest of Sera since the Pendulum Wars. His own guilty secret has been exposed: Adam knew the Locust existed deep below the surface of Sera long before Emergence Day, and were being driven from their tunnels by a lethal parasite known as the Lambent. Now he has to find a way to destroy the Lambent while the dwindling COG forces fight to hold back a growing Locust army that s threatening to overrun the city. As Adam struggles to find redemption in his comfortable island jail, Marcus seeks his own atonement in the squalid, closed world within the Slab s granite walls. While Dom Santiago and Anya Stroud fight to get him released, ready to make any sacrifice to free him, Marcus gradually finds unexpected kinship among Sera s most dangerous criminals and a way to carry on his personal war against the Locust."