For days the Voyagers' hot air balloon had drifted over a vast empty ocean. It was night when in attempting to land on a small island they crashed into the sea.Having been rescued by four youngsters on a fishing expedition, they discover that the island is all that is left of Monydra, once a great and powerful civilization which now lies under the sea.As over the years the level of the sea had continued to rise, flooding more and more of the country's precious land, most Monydrans had departed to found a new settlement in a far off land across the sea.Now the island's population is divided. Those who live in the city of Tlaxcala, close to the Temple of Kaluna, the Goddess of the Moon, belong to the Cult of Kaluna, worshiping her in the belief that by controlling the sea she keeps them safe. Those in the village of Gargas have chosen to stay, to persuade the citizens of Tlaxcala, their fellow Monydrans, family and friends, to join them in leaving the doomed island before it is too late.Keti, Shakata and Hal are swept up into what becomes a bitter and violent clash of opposing beliefs. They must confront the beautiful but wicked High Priestess of Kaluna who, in her ruthless quest for power and riches, will use any means necessary, including human sacrifice, to achieve her ends.As complications ensue and the struggle intensifies, the three Voyagers and their friends race against time to complete their preparations to escape the looming earthquake which they believe will wipe what remains of once great Monydra off the map.