The Long Night Book 1 Night Falls

They arrived without warning raining death and chaos across the surface of the Earth. Humanity fought back and although we didn't win we did cripple them fighting them to a standstill on the planet and in orbit. Now, more than a hundred years later, the world is a very different place. Technology varies wildly from region to region as does which race dominates the other. After so many decades of detente the enemy is once more on the move but not just against the surviving enclaves of humanity but also against members of their own species. In a small town on the shores of Lake Michigan a young man with a family relic represents humanities best hope to counter the alien advance. Aided by friends, family, and a nearly godlike computer surviving on the moon Owen Erindale stands between a new dawn and the Long Night."