This is it. Alpha team goes once more into the breach. On what will be their final missions ever in the Zulu Alpha - and the fight of their lives — Homer & Ali, and Predator & Juice, launch out into the terminal post-Apocalypse, as London is overrun by the very last rush of death covering the entire planet. Neither mission can fail, but can all four teammates survive? Or will some go down safeguarding the lives of those they love more than life itself?

In the north, the collapsed section of the Wall is defended only by the decimated remains of 2 PARA. Even reinforced by Jameson and the exhausted Royal Marines of One Troop, it's a doomed delaying action at best - and the last choke point in the entire ZA faces an incoming tide of dead stretching to the ends of the Earth. Meanwhile, hunkered down at CentCom, the unified ranks of our heroes, led by Ali and Fick, work furiously to fortify and reinforce what will be humanity's final fallback position - forever.

One Tier-1 Naval Special Warfare Operator, trained at the highest levels of any military, with 20-plus years of operational experience. One ex-cop civilian survivalist, who lived through two years of post-apocalyptic hell, unlike seven billion of her fellow humans. And an entire continent heaving with 400 million dead guys. To save the lives of his children, and rejoin Alpha team and the fight to save humanity, Homer must journey across a thousand miles of undead North America with Sarah Cameron, battling heavily armed bands of marauders who shoot first and ask questions never.

The Sea Wolf sets out to search for the Metal Islands. Leading the expedition is legendary Hell Diver Xavier Rodriguez. After enduring a decade on the poisoned surface, his survival skills will be put to the test on the dangerous open seas. But storms, sea monsters, and the cannibalistic Cazadores aren't the only threat to X and his small crew. Their mission will uncover hard truths about the history of the war that left humankind stranded in the air for centuries. The fate of those still living on the airships might very well rest on this perilous journey to find a new home.

Left for dead on the nightmarish surface of the planet, Commander Michael Everhart and his team of Hell Divers barely escape with their lives aboard a new airship called Deliverance. After learning that Xavier "X" Rodriguez may still be alive, they mount a rescue mission for the long-lost hero. In the skies, the Hive is falling apart, but Captain Jordan is more determined than ever to keep humanity in their outdated lifeboat. He will do whatever it takes to keep the ship in the air - even murder.