The first ghost of Mother of Pearl has been defeated, but this is only the beginning of the real war. The remaining ghosts are ready to bring all of Pearl Beach to its knees. And they are not alone in this battle. Skald, Anthony and Isadora will have to sink to the very bottom of the Sapphire Sea and find out what the Dark Waters hide. The underwater world confuses everything in its currents: good and evil, captivity and freedom, power and slavery. New enemies will be on the warpath. Sometimes the pursuit of revenge and justice can lead to fatal consequences that will irreversibly change the usual rhythm of life once and for all. What dangers lie in the depths of Ash? Who will become Queen of Sea Hearts? Whose side is the Supreme Mother playing on? This time no one will get away with it...