Astounding Stories of Super-Science, August 1930

But since the cubes could forestall his transmission of thought, and perhaps could read and understand thoughts, how was he to tell Jaska? How show her that a way of deliverance had been given into their hands, if they only possessed the courage to use it! Again came that thought, which Sarka recognized as the telepathy of his father: "Courage! You will win, and Jaska with you!" Thoughts could come in to them then, but could not go out. Or did it mean that the cubes, or the masters of the cubes, did not care if the prisoners received messages from outside, because they knew themselves capable of frustrating anything the prisoners planned? Perhaps. More than likely that was it. But, looking through the bottom of the globe, into the sea of white flames below, Sarka gripped more tightly his ray director, and tried to marshal the forces of his courage. There was surely some way of escape. Some way out of their strange predicament.