Maggie McCray is a student working on her master's degree in anthropology. During a scuba dive on the Columbia River collecting data for her thesis, she discovers an unusual petroglyph. Several months later on an elk hunt in the Bitterroot Mountains with her father's Native American foreman, he shows her the same image in a hidden cave his father had told him about. Her life takes a turn when a government agent, suspecting she knows the location...