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From the back cover: "Michael Kane, Earthman, had to return to Mars - to Vashu. He had left his heart there, with the lovely Queen Shizala, and on his home planet he found nothing but lonliness. From his arrival on, he found himself embroiled in a series of hair-raising adventures that led him inexorably to the obsidian city populated by the strange spidermen. And his flashing blade was his only defense against perils stranger than he - or any human - had ever encountered."