In Yellowstone National Park, at the beginning of the twentieth century, a girl of mysterious origins is adopted from infancy by Old Faithful geyser, and by a mother buffalo named Bearer of Song. Beloved to all the park, Flower of the Steam Basin grows up with their stories, proverbial sayings and teachings.

In time, having met a child her own age and her parents, trust ripens between families, and Flower of the Steam Basin gains a closely protective circle of human friends. At nine years old, she is brought face-to-face with Retired Lieutenant Ned Halpen of the Yellowstone Cavalry, whose exemplary career embodied the role of protector of Yellowstone's spiritual and physical heritage.

In the wake of Lt. Halpen's passing one year later, her sacred vow to continue his legacy brings both reward and mortal danger. And when the circle is breached, Flower of the Steam Basin and her father are forced to choose between her own safety and well-being and the performance of her sworn duties.

This is her story, as seen through the eyes of Yellowstone.