[Transcriber's Note: This etext was produced from Astounding Science-Fiction, October 1944. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.] Mark Kingman was surprised by the tapping on his windowpane. He thought that the window was unreachable from the outside--and then he realized that it was probably someone throwing bits of dirt or small stones. But who would do that when the doorway was free for any bell-ringer?…
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