He and his sisters had done their best. So had many librarians; who had found, not at all to his surprise, that no scrap of information or conjecture concerning Eddore or the Eddorians was to be found in any library, however comprehensive or exclusive. Thus he had guesses, hypotheses, theories, and visualizations galore; but none of them agreed and not one of them was convincing. He had no real facts whatever. Mentor had informed him, equably enough, that such a state of affairs was inevitable because of the known power of the Eddorian mind. That state, however, did not make Kit Kinnison any too happy as he approached dread and dreaded Eddore. He was in altogether too much of a dither as to what, actually, to expect. As he neared the boundary of the star-cluster within which Eddore lay, he cut his velocity to a crawl. An outer screen, he knew, surrounded the whole cluster. How many intermediate protective layers existed, where they were, or what they were like, nobody knew. That information was only a small part of what he had to have. His far-flung detector web, at practically zero power, touched the barrier without giving alarm and stopped. His speedster stopped. Everything stopped. Christopher Kinnison, the matrix and the key element of the Unit, had tools and equipment about which even Mentor of Arisia knew nothing in detail; about which, it was hoped and believed, the Eddorians were completely in ignorance. He reached deep into the storehouse toolbox of his mind, arranged his selections in order, and went to work. He built up his detector web, one infinitesimal increment at a time, until he could just perceive the structure of the barrier. He made no attempt to analyze it, knowing that any fabric or structure solid enough to perform such an operation would certainly touch off an alarm. Analysis could come later, after he had found out whether the generator of this outer screen was a machine or a living brain. He felt his way along the barrier--slowly--carefully. He completely outlined one section, studying the fashion in which the joints were made and how it must be supported and operated. With the utmost nicety of which he was capable he synchronized a probe with the almost impossibly complex structure of the thing and slid it along a feeder beam into the generator station. A mechanism--they didn't waste live Eddorians, then, any more than the Arisians did, on outer defenses. QX. A precisely-tuned blanket surrounded his speedster--a blanket which merged imperceptibly into, and in effect became an integral part of, the barrier itself. The blanket thinned over half of the speedster. The speedster crept forward. The barrier--unchanged, unaffected--was _behind_ the speedster. Man and vessel were through!