Since the Great Sundering, the world has been divided into two parts : the land of fire, a vast desert inhabited by the people of the Pyross, and the land of water, inhabited by the Hydross.
Peace between Hydross and Pyross seems impossible, but two young people, a Pyross named Skan and a young Hydross, Kallisto, meet one another in improbable circumstances and try desperately to stop the eternal war.