The Witches of Karres

Captain Pausert has a knack for making a living selling job-lots around the universe. He's a good man and saves three children from their slave masters only to find that they're the legendary witches of Karres and possess awesome psi powers.

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Captain Pausert thought he had finally made good with his battered starship, successfully selling off odd-ball cargoes no one else could sell. And then he made the mistake of freeing three slave children from their masters (who were suspiciously eager to pan with them). No good deed goes unpunished, and in fact the harmless-looking little girls were three of the notorious Witches of Karres. A rollicking novel from the master of space adventure.