The Keeper of the Isis Light is a science fiction novel for young adults by Monica Hughes, published by Hamish Hamilton in 1980. It is the first of three books in the Isis series, or The Isis Trilogy in its omnibus edition. They are set in the distant future on the planet Isis, which revolves around the F5 (yellow-white) star Ra in the constellation Indus (all fictitious). Keeper won the 2000 Phoenix Award from the Children's Literature Association as the best English-language children's book that did not win a major award when it was originally published twenty years earlier. The award is named for the mythical bird phoenix, which is reborn from its ashes, to suggest the book's rise from obscurity. Atheneum Books published the first U.S. edition under its Argo Books imprint in 1981. WorldCat libraries report holding early Danish, German, and Swedish-language editions and a 2002 French-language edition. Plot summary Olwen is a young human woman living on the planet Isis as the keeper of the Light (a navigation beacon). Her parents having died, her only companion is a robotic DaCoP (Data Collector and Processor), called Guardian. On Olwen's 16th birthday (10th on Isis), the Guardian tells her that settlers are coming from Earth to Cascade Valley. Olwen is in distress thinking that these settlers will ruin her perfect world. Guardian explains that she must wear a special protective suit to protect her from the viruses and bacteria the settlers might be carrying. One of the younger settlers, Mark London, falls in love with Olwen, and Olwen wishes Guardian to allow her to see Mark without her suit. Guardian refuses. One day, Mark overhears Guardian discussing some of Olwen's blood samples with Dr. MacDonald and he thinks Olwen might be in trouble so he climbs up towards her house. When he sees Olwen, he suffers an accident and falls from the top of Lighthouse Mesa. This turns out to be because of his shock at Olwen's appearance under the suit. Later, Guardian tells Olwen the truth about the death of her parents, and his subsequent care of her as her mother wished. To keep Olwen safe, he changed her genetically, so the ultraviolet rays from Isis' sun, Ra, would not harm her, allowing her to climb to Isis' mountain heights. Shocked at the realization that Mark fell because of her, Olwen tries to enjoy playing with her favourite