From the series: Court of Sin

Frostbound Throne: Song of Heaven and Ice (Court of Sin, #3)

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About

 Devi holds the power of all elements in her grasp. Vale can manipulate the minds of those who oppose him. 
They won’t be enough. 
The bastard son of the last overking has moved to take the throne ruling over the entire Isle, and no army, no power can hope to win against his forces. 
They have but one option: claim the frostbound throne. 

Song of Heaven and Ice will complete the Frostbound Throne trilogy.