Years after the catastrophic merging of Earth and Mars and the birth of Avalon, Robert's quiet life as a hermit is once again shattered. A dazzling new theme park rises on his world, drawing attention he never wanted - but far beyond the solar system, a verified threat is closing in, one capable of extinguishing Avalon entirely.

To prepare, Robert pushes his abilities to new extremes. A mysterious Source offers power and insight, but its gifts come with consequences. As planets are stripped for material to construct a colossal Dyson-sphere defense, Avalon faces relentless attacks from hostile forces determined to break its fragile peace. Amid the chaos, Robert uncovers a superior Dyson sphere of unimaginable potential - and peril.

Driven by duty, love, and the stubborn hope that Avalon can survive, he risks everything to claim the sphere's secrets. But in the darkness of its vast interior, he confronts a truth far more dangerous than any enemy: the cost of ambition, and the price of becoming the world's last line of defense.