Petaybee Series by Anne McCaffrey, Elizabeth Ann Scarborough

Strange things were happening on the icy planet called Petaybee. Unauthorized genetically engineered species had been spotted. Geologic survey teams sent to locate newly detected mineral deposits were either coming up empty - or disappearing altogether. And the locals weren't talking - especially not to the company bent on exploiting the planet... moreStrange things were happening on the icy planet called Petaybee. Unauthorized genetically engineered species had been spotted. Geologic survey teams sent to locate newly detected mineral deposits were either coming up empty - or disappearing altogether. And the locals weren't talking - especially not to the company bent on exploiting the planet.Disabled combat veteran Yanaba Maddock seemed to the company to be the ideal spy: the frailty that made her no further use to the military would be a perfect blind to allow her to get close to the Petaybean natives. But miraculously, with her relocation to the arctic planet came a return of Yana's health and strength. And the more she got to know they people of Petaybee, the more determined she became to protect her new home.For something strange and wonderful truly was happening on Petaybee. Something worth fighting for, or even dying for - but, especially, something worthy living for... less

Yanaba Maddock's short-lived career as a company spy had ended the moment the planet Petaybee and its people had adopted her as one of their own. Now she was dedicated to keeping Intergal from exploiting and wounding--or even killing--the world she had come to love. For Intergal persisted in denying that Petaybee was sentient, and nothing would stop it from stripping the ore-rich planet--sentient or not... moreYanaba Maddock's short-lived career as a company spy had ended the moment the planet Petaybee and its people had adopted her as one of their own. Now she was dedicated to keeping Intergal from exploiting and wounding--or even killing--the world she had come to love. For Intergal persisted in denying that Petaybee was sentient, and nothing would stop it from stripping the ore-rich planet--sentient or not. Only solid evidence would convince the company to leave the planet alone, and for all its sentience, Petaybee's communications were highly subjective; indeed, some outsiders seemed entirely immune to its voice. So Yana and her friends would have to find some other way to prove that the planet was worth more to the company alive than dead... less

Like a child, the sentient planet Petaybee is growing--learning to respond and communicate. Yanaba Maddock has appointed herself defender of her adopted planet, protecting it against outsiders who seek to plunder its resources. Then Yanaba is kidnapped and the price of freedom is Petaybee itself. The rousing conclusion to Powers That Be and Power Lines. HC: Del Rey.