Isis Series by Monica Hughes

It was her tenth birthday on Isis. By Earth years, she would be sixteen. But Olwen Pendennis had never been to Earth. She had been born on Isis. And since her parents' death, she had lived there alone, manning the Isis Light -- a "lighthouse" in space designed to aid ships, and to bring settlers from Earth. And now, on the day of her tenth year, the settlers are coming at last. Olwen is ready to welcome them, but are they ready for her? She was once human, like them... moreIt was her tenth birthday on Isis. By Earth years, she would be sixteen. But Olwen Pendennis had never been to Earth. She had been born on Isis. And since her parents' death, she had lived there alone, manning the Isis Light -- a "lighthouse" in space designed to aid ships, and to bring settlers from Earth. And now, on the day of her tenth year, the settlers are coming at last. Olwen is ready to welcome them, but are they ready for her? She was once human, like them. But the harsh climate of the alien planet has changed her, transformed her into something else -- something the settlers could never be prepared for... less

Years have passed on Isis, but life has gone backward, not forward. Under their leader, Mark London, the settlers have abandoned the technological knowledge of their forefathers. Upper Isis is now a forbidden zone, and the history of the first inhabitants from Earth has been replaced by myth. But one inquiring young man yearns to know the truth, and soon he gets the chance to find it.

Michael Joseph Flynn has devious plans to cheat and corrupt the inhabitants of the planet Isis, and he appears to be on the verge of success. Few among the planet’s simple agricultural community can resist his magic firestone, his strangely delicious Ambrosia, and the Forever Machine. Only Flynn’s daughter, Moira, can unmask this smooth-talking pedlar. But can Moira avert disaster in time?

The Keeper of the Isis Light is the first book in Monica Hughes’ acclaimed trilogy, and it is the story of Olwen Pendennis, the Keeper of the Isis Light. She and her companion, Guardian, have lived alone on the remote planet Isis since the death of her parents. Now, colonists from an overcrowded and polluted Earth have landed and are settling in the valleys. Olwen fears these new inhabitants may ruin her world forever, and it seems she may be right... moreThe Keeper of the Isis Light is the first book in Monica Hughes’ acclaimed trilogy, and it is the story of Olwen Pendennis, the Keeper of the Isis Light. She and her companion, Guardian, have lived alone on the remote planet Isis since the death of her parents. Now, colonists from an overcrowded and polluted Earth have landed and are settling in the valleys. Olwen fears these new inhabitants may ruin her world forever, and it seems she may be right. Years later, in Hughes’ sequel, The Guardian of Isis, the planet remains pristine and remote, even after the arrival of settlers from Earth. Over time, the settlers have abandoned the technological knowledge of their ancestors and replaced it with myth. But one young man seeks the truth, and he soon gets the chance to find it.The final chapter in the Trilogy, The Isis Pedlar, brings the devious Michael Joseph Flynn and his daughter, Moira, to Isis. Michael’s magic firestone, his strangely delicious ambrosia, and his mysterious Forever Machine are beguiling to the humble members of the Isis community. Only Moira can expose this smooth-talking pedlar for the charlatan that he is. But will she be able to do it in time to save the simple agricultural community? less