An epic interstellar tale of war from a master of science fiction. One more tour on the red. Maybe my last. They made their presence on Earth known thirteen years ago. Providing technology and scientific insights far beyond what mankind was capable of. They became indispensable advisors and promised even more gifts that we just couldn't pass up. We called them Gurus. It took them a while to drop the other shoe. You can see why, looking back. It was...