In the spring of 1898, A. E. (Alexandria) Bartram—a spirited young woman with a love for botany—is invited to join a field study in Yellowstone National Park. The study’s leader, a mild-mannered professor from Montana, assumes she is a man, and is less than pleased to discover the truth. Once the scientists overcome the shock of having a woman on their team, they forge ahead on a summer of adventure, forming an enlightening web of relationships as they move from Mammoth Hot Springs to a camp high in the backcountry. But as they make their way collecting amid Yellowstone’s beauty, the group is splintered by differing views on science, nature, and economics.