Predentia is set to show the realm they are undefeated with the upcoming splendor of the chariot races. A restless King Horton is keen to forge an alliance with the new king of Vallandria by tempting him with the offer of marriage to one of his daughters. Demelda, the youngest princess, nervously awaits her fate. Will she be chosen to marry the mysterious new ruler that may not be all he seems?

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Meanwhile, having been imprisoned for his new found abilities, Kavic desperately tries to break free to rescue the princess from all those who seek to use her. With the help of an unlikely source, he races against time to save her from a lifetime of misery married to a tyrant.

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With the impending prophecies hanging on everyone's lips, the rulers of Cassadon desperately search for the only thing that can keep their iron grip on their thrones: the highly coveted golden trident that possesses the power of the sea.

Can Demelda and Kavic acquire the sacred merfolk sceptre before the human rulers can abuse its power? As the battle reaches the high seas, no one is safe in the scramble for ultimate dominion.