Dane Thorson and fellow crew members of the trader ship Solar Queen are invited to investigate a mystery. The planet Khatka, a jungle world used as a hunting preserve for rich tourists, is being affected by a powerful sorcerer/magician. He is slowly altering the landscape of the animal world, by using mysterious psychological powers to induce hallucinations and mind control. The adventure is taken up with the the hunt for the sorcerer. Explanations are thin at best, and the story is too short to have much impact, beyond mild entertainment. Skip this one, and opt instead for virtually any other Norton novel.