Olwen Pendennis and her Guardian live in splendid isolation on the planet Isis of the star Ra, maintaining the beacon which announces the presence of this habitable planet to any space travelers, till the day of Olwen's tenth birthday. She would be sixteen in earth years, and she has never seen anyone but Guardian.
But eighty settlers arrive in the space ship Pegasus Two, with Captain Jonas Tryon. They will now live on the planet that Olwen has considered her own. She tries to put aside her childish, selfish impulses and finds herself curious about the newcomers.
Guardian makes her an isolation suit with a face-mask, to protect her in case the settlers have any germs which would harm her.
Mark London is one of the settlers. At seventeen, he is the oldest of the twenty children among the settlers, and Jody N'Komo is the youngest at nine...