When Sepron the Sea Serpent promises to bring floods, starvation, and fear to the people of Avantia's coast, Tom and Elenna must figure out a way to stop the terrifying beast.
When Tom and Elenna encounter Malvel while searching for the armor that he stole, they learn that the wizard has unleashed a new wave of evil beasts against Avantia, and set off to face the first of these, the mysterious Zepha.