Fourteen-year-old Jeff Wells and his robot friend Norby are suddenly transported back to 1785 in France, where they become involved with a priceless necklace, royal politics, and the accidental creation of alternate futures for Earth.
Janet Asimov (maiden name Janet Opal Jeppson, born 1926) is an American science fiction author, psychiatrist, and a psychoanalyst.
Janet Asimov started writing children's science fiction under the name J. O. Jeppson in the 1970s. She was married to Isaac Asimov from 1973 until his death in 1992, and they collaborated on a number of science fiction books aimed at young readers, including the Norby series.
Janet Asimov. Wikipedia.