For millennia, battles raged between the Sartans and Patrins. The Sartans divided the single world into four... and disappeared. But now the two peoples have met again, and the war has broken out with renewed vigor. The main characters, Patrin Eplo and Sartan Alfred, find themselves in one of the four worlds that they have not yet explored - the World of Water, Chelestra. And here Alfred finds his seemingly forever lost fellow tribesmen, and Eplo finds his eternal enemies - the Sartans. An unexpected threat to friends is the struggle between the Sartans and the Patrins for undivided dominance over the four worlds. Is it possible to end centuries of hostility? After all, so far only Alfred and Eplo understand that both the Sartans and the Patrins have a much more ancient and much more powerful enemy...