Overtaken — R.W.K. Clark

They have come… The skies over major cities all around the world have grown dark. Massive crafts from space block the sun, and the inhabitants of these ships want Earth for their own. The aliens have made their demands, and they are more frightening than anyone could have ever imagined. In this gripping alien invasion novel, human-like aliens arrive with the intention of taking over the planet for their own habitation. They intend to rid the world of humans, and have devised a method of determining who will live to see another day, and who will die, not worthy of life. The aliens are technologically advanced, and Earth's powers that be cannot seem to figure out a way to victoriously thwart the plans of these aliens, known as the ‘Oppressors'. These alien invaders will test every last human and send the victors to a new planet to begin again, never to see their friends or loved ones. But only a small percentage of Earth's inhabitants can go. Josh works at the Pentagon writing code, and his newfound love, Kamryn, a brilliant computer hacker, work together hacking the aliens in this apocalyptic survival novel.