The keeper of the Isis light
Sixteen-year-old Olwen, who lives alone on the planet Isis with her faithful robot, falls tragically in love with an arrival from earth who is unaware that her natural form has been hidden in a humanlike space suit.
Science fiction, Large type books, Children's fiction
Monica Hughes        
Monica Hughes OC (November 3, 1925 – March 7, 2003) was an English-Canadian author of books for children and young adults, especially science fiction. She also wrote adventure and historical novels set in Canada, and the text for some children's picture books. She may be known best for the Isis trilogy of young-adult science fiction novels (1980–1982).

**Source**: [Monica Hughes](https://en.wikipedia.org/wiki/Monica_Hughes) on Wikipedia.