The ancient struggle between the fading pagan traditions of Avalon and the rising influence of Christianity serves as the catalyst for a tragic conflict between siblings. Morgaine, a priestess of the Great Mother, finds her loyalties tested as she navigates the political and spiritual shifts of Britain. Her objective is to preserve the old ways against the encroaching patriarchal structures, but she is constantly opposed by the very brother she once loved, King Arthur. The narrative unfolds through a non-linear, multi-perspective framework that highlights the internal and external pressures placed upon the women of Camelot.

This work is widely regarded as a seminal contribution to the Arthurian subgenre, noted for its shift in focus toward the female experience. Readers and critics often highlight the depth of the world-building and the nuanced portrayal of religious conflict. The narrative is frequently praised for its ability to humanize figures traditionally relegated to the periphery of the legend. It remains a significant touchstone for those interested in feminist interpretations of classic mythology and folklore.