Heechee Saga - 4: The Annals of the Heechee

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Deep inside a nearly solid ball of energy called the kugelblitz, just outside the halo of the Milky Way, lurked the would-be destroyers of the universe. Humans called them the Foe. Heechee called them the Assassins. No creature that had ever seen them had lived to tell the tale. But ancient ruins scattered about the galaxy, and the shattered remnants of races such as the Sluggards and the Voodoo Pigs, were evidence of the Foe’s devastating power—and their cold-blooded determination to destroy all intelligent life. For eons now, the Foe had been strangely silent, but galactic history made clear that they could strike again at any time. So Heechee and human had joined in a constant vigil at the edge of the kugelblitz. Advanced Heechee technology had enabled Robinette Broadhead to live after death as a machine-stored personality. But even he, virtually immortal and with unlimited access to millennia of accumulated data, could not discover what the Foe were—or how to stop them. Now it looked as if the Foe had ventured out again. As humans and Heechee rallied their forces to defend against an alien race that had never met defeat, Robin Broadhead found himself the only one able to deal with the Foe face to face—a meeting which would determine the future of the entire universe…