The Rainbow Sword

From the back cover of the Avon first edition: The third generation - "Go to Byzantium." The words rang like crystal in his mind. The voice was the same voice that echoed in his dreams. Not it spoke of Forces of Darkness rising in brilliant Byzantium, soon to cast cold shadows on the fate of the World. Gently commanding, it urged Geoffrey to journey to that distant empire... for it was his destiny to vanquish the powers of evil, as had his father and his father's mother before him. Then, as it vanished, the voice whispered of a copper-haired enchantress and the sword she carried - a weapon with primal powers, forged before time began - and waiting for him to claim it. The Rainbow Sword - What was its power? Who was its keeper? And why was Geoffrey fated to wield it?