In the previous two novels--The Trees Inspire and The Trees Endure, set in rural Pennsylvania from 1897 to 1903--Rebecca Wagner longs to be more than a farm girl. After becoming a trained nurse, she returns to the Juniata Valley eager to forge her own path as an independent woman--working for the town doctor, and in the primitive and hostile lumber camps in the Shade Mountains where she is threatened by man and beast.

In this final novel, Rebecca must decide whether to live her life as white woman or reveal her true lineage and face losing her quest to be the healer she has worked so hard to become. But her mixed race and the destruction of the forests in the nearby Shade Mountains undermine everything she believes in.

However, one thing does remain clear: Ben, the man Rebecca's has loved for many years has accepted her heritage and agrees to marry her in a secret Iroquois ceremony near the family farm. What they don't know is that their secret ceremony is no longer a secret. When they try to marry in the church the preacher calls off the wedding, claiming the council won't marry them because they participate in heathen ceremonies. In hopes of saving their reputation, they are quietly married by a justice of the peace.

Over the next year, Rebecca continues to work in the town doctor's office, but a growing number of men and women refuse to have her treat them. Soon her reputation as a nurse is threatened by those who accuse her of being a heathen. To make matters more difficult, when she travels to the dangerous lumber camps to take care of the "wood hicks," they won't allow her to touch them. When their rejections jeopardize her livelihood, Rebecca fears for her future.

More trouble ensues as Ben's buggy business is experiencing the same accusations from its customers, forcing him to try to find another way to support himself and his new wife. Tensions grow between them, along with the realization that the coming perils of winter will force them to leave the small cabin where they have been living deep in the mountains.

Soon violence against Rebecca's Iroquois mentor Back So Straight escalates. First the plants and herbs she stores in her cabin are burned. Then forest fires, clear cutting, and the erosion that takes with it small trees, shrubs, and plants, denude the mountainsides and fill the streams with silt. When her beloved dog is shot and killed, Back so Straight loses her only remaining link to her family. Finally, her cabin is burned to the ground, forcing her to live in a cave in the mountains. When a group of men try to rebuild her home, the church council refuses to permit them to finish. Despite her losses, Back So Straight continues to teach Rebecca about the plants and trees her ancestors used to heal for thousands of years. But now that the nearby mountains are ruined, they need to travel far into the neighboring mountains to find them.

While a lumber camp closes because the "wood hicks" develop consumption, and another when the horses suffer from disease, the only remaining camp is declining from over- harvesting. Rebecca's livelihood begins to disappear like the surrounding forests. Adding to her worries, Rebecca's father loses his hand in a lumber mill accident and becomes increasingly aware of his plight: a domineering wife, daughter and son whom he has alienated, land he cannot farm, and work he can no longer do.

The situation becomes particularly perilous after Rebecca gives birth to a long-awaited daughter. Now she must decide whether to reveal her heritage--realizing that if she does, she and those closest to her may be dangerously threatened by the truth.