The Ghost Sister

The fate of a planet lies with an outcast woman and a mysterious visitor....
In this richly imagined and thought-provoking novel, Liz Williams tells the story of a world engineered to preserve the precarious balance between animal and human. To this world comes an emissary from a distant planet who will walk the razor-thin line between consciousness and instinct, freedom and conformity, life and death.
On Monde D'Isle a rugged people live in union with their world. They migrate with the tides of the moon, sense the meridians of the planet, and slip into a Dreamtime that grants them access to -- and escape from -- the darker urges of their animal nature.
Mevennen ai Mordha is out of tune with her people's "bloodmind." She is protected by her devoted brother Eleres, who refuses to listen to those who say that Mevennen is not fit to live. Still, Mevennen fears that even her brother will give in to his instincts during the time of the hunt, when the Mondhaith seek out the weakest as their prey.
Taking her on an expedition in hope of a cure, Eleres has brought Mevennen deep into the wilderness. There they are visited by a strange woman who they are certain is a ghost, but who is really a Gaian anthropologist charged with bringing utopia to their world. She promises to heal Mevennen -- but it is a promise that comes with a terrible price....