Copyright, 1961, by John W. Campbell, Jr. An earlier version Copyright, 1932, by Experimenter Pub. Co. An Ace Book, by arrangement with the Author. All Rights Reserved Cover by Gray Morrow. Printed in U.S.A. The famous scientific trio of Arcot, Wade and Morey, challenged by the most ruthless aliens in all the universes, blasted off on an intergalactic search for defenses against the invaders of Earth and all her allies.…
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