Catherine Weldon, a widowed artist from Brooklyn, embarks on a journey to Dakota in the late 19th century, driven by her passion for painting Native American leaders. Her primary goal is to paint a portrait of Sitting Bull, the renowned Lakota Sioux chief. As she arrives in the West, she faces resistance and hostility, not only from the U.S. Army but also from local settlers who view her presence and intentions with suspicion. Despite this, Catherine's determination leads her to Sitting Bull’s camp, where she begins to develop a friendship with the chief. Throughout their interaction, she educates herself about the struggles and injustices faced by the Sioux people.

As Catherine becomes increasingly involved in the plight of the Native Americans, she finds herself caught in the midst of political tensions and power struggles between the Sioux tribe and the U.S. government. Her bond with Sitting Bull strengthens, revealing the complexity and depth of his character beyond his public image as a warrior. Catherine’s presence and advocacy begin to stir significant conflict, both within the Native American community and with external forces. Her journey evolves from a mere artistic pursuit into a profound quest for justice, solidarity, and understanding.