The sudden appearance of a second space elevator in Brazil only deepens the mystery about the aliens who provided it: the Builders. Scavenger crew captain Skyler Luiken and brilliant scientist Dr. Tania Sharma have formed a colony around the new Elevator's base, utilizing mobile towers to protect humans from the Builders' plague. But they are soon under attack from a roving band of plague-immune soldiers. Cut off from the colony, Skyler must wage a one-man war against the new threat as well as murderous subhumans and thugs from Darwin.

Skyler Luiken and his ragtag crew of scavengers, scientists, and brawlers have a new mission: a long journey to a distant planet where a race of benevolent aliens are held captive behind a cloud of destructive ships known as the Swarm Blockade. No human ships have ever made it past this impenetrable wall, and Skyler knows not what to anticipate when they reach their destination.

In the mid-23rd century, Darwin, Australia, stands as the last human city on Earth. The world has succumbed to an alien plague, with most of the population transformed into mindless, savage creatures. The planet's refugees flock to Darwin, where a space elevator - created by the architects of this apocalypse, the Builders - emits a plague-suppressing aura. Skyler Luiken has a rare immunity to the plague. Backed by a crew of fellow "immunes", he leads missions into the dangerous wasteland beyond the aura's edge to find the resources Darwin needs to stave off collapse.

Captains Skyler Luiken and Gloria Tsandi (and their respective crews) have smashed through the deadly Swarm Blockade but now find themselves scattered around the planet Carthage and the space stations she holds in her orbit. Their mission is now twofold: destroy the military compounds of a race of nefarious alien overlords and find a way back home to Earth. Standing in their way are a race of horrifying, technologically advanced aliens armed with incredible weapons.

The Interdependency, humanity’s interstellar empire, is on the verge of collapse. The Flow, the extra-dimensional conduit that makes travel between the stars possible, is disappearing, leaving entire star systems stranded. When it goes, human civilization may go with it - unless desperate measures can be taken. Emperox Grayland II, the leader of the Interdependency, is ready to take those measures to help ensure the survival of billions. But nothing is ever that easy.