Meet Marcus Donovan; astronomer, day dreamer, and smart ass. He was just another researcher in a jumpsuit until he saw something that didn't fit. At the time, it was nothing but a blip on a sensor read-out, an asteroid that wasn't an asteroid, but it became his obsession. He named it Zebra-1, and now he's hurtling through the solar system on a mission to see it in person. Meanwhile, the Earth has its own visitors. Seven massive vessels appear out of nowhere and rain hell down from orbit, reducing civilization to a pile of ashes and rubble. Our world is conquered before anyone even knows we're under attack.