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Nathan Never is asked by Cora, wife of Professor Alex Arnold, to investigate her husband's mysterious death. Arnold had been, years earlier, scientific director of a mission on an asteroid during which he had found, and opened, a casing of probable alien origin. Nathan, with the help of shuttle pilot Jerry Lone, sets out on the trail of Herbert Benson, the last person to have met Arnold. But the professor's fate is also of interest to Aristotle Skotos and the Shadow Brotherhood...