The Earth Interregnum: The Collected Edition: Free Story Friday Collections, Book 3 (Unabridged‪)‬

At the dawn of the twenty-second century, the human race is poised for greatness. The Solar System is being rapidly colonized, and the stars are almost within reach. The future potential seems limitless.

Then it all changes.

Two alien fleets appear near the orbit of Saturn and fight their way across the system, savaging everything in their path. When the fighting is finished, the human species enters the 500 years known as the Interregnum--a period of rebuilding, warfare, and discovery.