Kestrel Hath’s schoolroom rebellion against the stifling caste system of Aramanth leads to explosive consequences for her and her family: they are relegated to the city’s lowest caste and are ostracized. With nothing left to lose,Kestrel and her twin brotherBowmando the unthinkable: they leave the city walls. Their only hope to rescue the rest of their family is to find the key to the wind singera now-defunct device in the city’s centerwhich was once the course of happiness and harmony in Aramanth. But the key was given to an evil spirit-lordthe Morahin exchange for the Morah’s calling off its terrible army of Zars. Armed with desperate braverywitsand determinationKestrelBowmanand a tagalong classmate set off to find the key. Along the way they meet allies and foesbut in order to succeed in their questthey must face the most sinister force of all: the powerful Morah.