Isaac Asimov & Janet Asimov 
Norby Finds a Villain & Norby Down to Earth [EPUB ebook] 

In the sixth volume of the complete children’s sci-fi series, Jeff and Norby reunite with an adventurous princess and uncover the mystery of Norby’s maker.Norby Finds a Villain Jeff and his mixed-up robot, Norby, are joined by red-headed Rinda, Crown Princess of the planet Izz, and Rinda’s small robot, Pera. Their time-travelling adventures take them from the Pleistocene period to five hundred years into a false future. Along the way, they must tame evil forces of Ing the Incredible Ingrate and bring back the Others, the intelligent and wise beings from ancient times. Norby Down to Earth Jeff Wells has a space dynamics test coming up at the academy, but when he hears that his brother, Fargo, is in trouble down on Earth, he and Norby blast into hyperspace and head home to help. It turns out that Fargo has tripped into a mystery involving zapped robots and stolen computer parts. Norby, in his inimitable mixed-up way, manages to jump into the middle of the mystery through his research into Mac Gillicuddy, his maker. It seems that Mac Gillicuddy left behind a very strange family. . . .