Queen Maeve has declared war upon the province of Ulster in an effort to take possession of the Brown Bull of Cooley. Ultimately, this is an attempt to match the wealth of her husband, King Ailill of Connacht, who owns a magnificent white bull. Only Cuchulainn, a boy warrior, stands between Ulster and certain annihilation. Supported by the Morrigan, the goddess of war, he begins a reign of terror upon the Connacht warriors. In his heroic stand, the reader discovers the genesis of the determination of the Irish people, their will to stand alone against oppression.