Enmerkar, the great high priest of the distant Sumerian kingdom, and Aratta, the ruler of Dur-Sharrukin, decide to join forces to build a monument worthy of the glory and power of their god Enki. They plan to build a tower of such a height that it will be visible from the most distant lands of the barbarians to the great cities of the East. To find his mother Frilla and his teacher Sartigan, Amos Daragon sets out on a long journey to Sumer. Together with his faithful friends Beorf, Lolla and Medusa, the Lord of the Masks must overcome numerous traps and obstacles on the way to the El-Bab Tower. He sets out to free his mother and tame the Sumerians, who threaten to turn the fragile balance of the world into universal chaos, the likes of which have never been seen before. But the task is so difficult that this adventure may be the last...