Fin and Marrill embark on an exciting journey in search of Fin's mother, who disappeared many years ago. It seemed to the friends that they had found a new faithful ally in the girl whom everyone forgot (just like Fina!), and that now the three of them could challenge any powerful wizard. However, Fin and Marrill were wrong... The girl pursues her goals - she hunts for the Ball of Desires, which is capable of summoning a deadly Iron Tide, sweeping away everything in its path. Will Fin and Marrill have the courage and fortitude to finish what they started?! After all, this time they will have to confront that same Lost Sun, glorified in the old legends of the Pirate River...