The Witches of Karres

Captain Pausert thought his luck had finally turned - but he did not yet realize it was a turn for the worse. On second thought, make that a turn for the disastrous!
Unlucky in love, unsuccessful in business, he thought he had finally made good with his battered starship Venture, cruising around the fringes of the Empire and successfully selling off odd-ball cargoes which no one else had been able to sell. He was all set to return home, where his true love was faithfully waiting for him...he hoped.
But then he made the fatal mistake of freeing three slave children from their masters (who were suspiciously eager to part with them). They were just trying to be helpful, but those three adorable little girls quickly made Pausert the mortal enemy of his fiancee, his home planet, the Empire, warlike Sirians, psychopathic Uldanians, the dread pirate chieftan Laes Yango - and even the Worm World, the darkest threat to mankind in all of space.
And all because those harmless-looking little girls were in fact three of the notorious and universally feared Witches of Karres.