Only the four may enter only the four may pass… 

Behind the padlocked gates to Blackcrowns boarding school, a terrible secret lurks, one known only by its governor, Mendra Mordell. 

As Mendra schemes her next plan with elation, she awaits the arrival of someone especially close to her. A union, with the potential to destroy the heart of The Element Order and devastate Earth.

Following their success in the fire realm, and capture of the crown of fire, Ella, Harriet and Ollie have reached the Water realm ruled by Ida and his army of Tetramentals. But at a cost, having lost one of their own, in the process.

The light of their elemental powers is maturing, but with it comes grave darkness. Without Jack, will the Element Order evade the Tetramentals that rule this treacherous realm, and retrieve the crown from Ida? Or will his absence, thwart their destiny, and weaken their resistance to that darkness.