Invaders Author:Gordon R. Dickson No planet is safe...Any time. Any place. Earth. The Moon. In the far reaches of the Solar System, or somewhere out among the stars. No planet is safe, because no one knows how clever or powerful the enemy may be. — But danger lurks not only without. Invasions can be launched from within, by those one thought one's own; these will be deadliest... more » of all.
Those who lead us away from Earth will be only the first to face the danger - but the universe is a fine thing, and worth fighting for.« less