The Orion Plan: A Thriller

Scientists thought that Earth was safe from invasion. The distance between stars is so great that it seemed impossible for even the most advanced civilizations to send a large spaceship from one star system to another.
But now an alien species—from a planet hundreds of light-years from Earth—has found a way.
A small spherical probe lands in an empty corner of New York City. It soon drills into the ground underneath, drawing electricity from the power lines to jump-start its automated expa...