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Dedicated to the protection of humanity in the twenty-third century, the Cerberus warriors have repelled numerous alien parasites that would prey on mankind. But the Cerberus team clashes with otherworldly scavengers wielding technology far in advance of their own when they investigate a spaceship crash site. The spaceship belongs to citizens of a magnificent airborne city located in a quantum rift. They have been hording alien technology and using the superscience they'd stolen to build a futuristic haven. But their benevolent ruler is about to be challenged for his throne, a challenge that threatens to turn earth into a testing ground for alien weapons of unimaginable destruction. Unless the Cerberus warriors can find a way to stop the escalating crisis.