Tash and Zak, visiting the planet D'vouran with their mysterious Uncle Hoole, find themselves in the middle of a plot developed by the evil Empire to use science to create murderous mutants.
Thirteen-year-old Tash, her younger brother Zak, and their Uncle Hoole visit the planet D'vouran, where they encounter the sluglike crime lord Smada the Hutt and reports of people vanishing into thin air.
