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This etext was produced from Astounding Science Fiction September and October 1959. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed. Minor spelling and typographical errors have been corrected without note. Subscript characters are shown within {braces}.
Usually, the toughest part of the job is stating the problem clearly, and the solution is then easy. This time the FBI could state the problem easily; solving it, though was not. How do you catch a telepathic spy?
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