This Ace edition follows the text of the first hard-cover book edition, originally published in 1931. Under the double moons of Barsoom, an invisible flier sped to the mysterious city of Jahar where Sanoma Tora, the kidnapped princess of Helium had been taken. Hadron of Hastor was at the controls, hatching a rescue plan that required unusual daring and great ingenuity. For invisibility alone was not a great enough weapon against "The Death."…
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