When Sheriff Hayden Duke steps through a portal hunting the mysterious arms dealer known as the Marquise, he quickly realizes he just voluntarily entered Hell. Trapped in a deadly maze with Space Marine Caleb Card, they’ll need to rely on all of their individual strengths—and each other—if they want to survive. Demons stalk the corridors. Shifting walls hide deadly secrets. And somewhere in the darkness, a powerful enemy plays a game where the stakes are higher than anyone realizes.

Earth. After the invasion. The planet is in ruins. Humankind struggles to survive. Hayden is a Sheriff in a world without law. A good man in a world gone bad. He knows the fallout of an alien attack when he sees it. He's never seen anything like this before. Isaac is a Marine in a world without order. A good man with troubles of his own. His mission was to protect the innocent, including his son. Instead, he's the only survivor.

Caleb is a former Marine Raider and commander of the Vultures, a search and rescue team that's spent the last two years pulling high-value targets out of alien-ravaged cities and shipping them off-world. When his new orders call for him to join 40,000 survivors aboard the last starship out, he thinks his days of fighting are over. The Deliverance represents a fresh start and a chance to leave the war behind for good. Except the war won't be as easy to escape as he thought.

Two hundred years ago, aliens invaded Earth. A violent war followed. The enemy won. Some of us escaped, most of us didn’t. On Proxima they flourished - the invasion forgotten. On Earth we floundered - the horror began. Their world is advanced, peaceful, and secure. Our world is broken, savage, and overrun. A new invasion is coming. A hunger that has swallowed half the universe. They don’t care which planet we live on. They want to end us all. But where there is life, there is hope. And where there is hope, there are heroes. This time, vengeance will be ours.

The invaders are gone. Earth is in ruins. The strong prey on the weak. In the wastelands of what’s left, a lone gunslinger delivers his own brand of justice. Some call him lawman. Some call him madman. Some call him vigilante. Some call him killer. Some call him legend. They all call him...the Sheriff. This is his story.