Much like King Xavier, aka The Immortal, this series just keeps plugging along despite the fact that the plot has reached multiple points where it could have been wrapped up nicely. I can't help but feel that this series is going to keep going until it ends in ruin, but luckily for us that point still hasn't arrived. Book 8, King of the Wastes, centers around the fact that the King has come to the conclusion that the Vanguard Islands are not sustainable. He knows that their recent victories have resulted in a population size that they can no longer provide for, not to mention that the structures that compose the Vanguard Islands are desperately in need of replacement parts that can't be manufactured. They need to expand their reach and a supply chain will need to be set up to allow for scavenging of resources from a much wider area. King Xavier has his eye on establishing an outpost near the Panama Canal in order to provide a means to scavenge both coasts of the Americas, but that idea is not new. It was also tried by his predecessor and it resulted in failure. The difference this time around is that King Xavier has the ability to once again call upon the Hell Divers to risk their lives so humanity can survive
Hell Divers 8: King of the Wastes - more apocalyptic goodness