"The Folk of the Air" is a young adult fantasy trilogy written by Holly Black. The series follows Jude Duarte, a mortal girl living in the treacherous world of Faerie, where she navigates political intrigue, betrayal, and her desire for power among the Fae. The trilogy includes three books: "The Cruel Prince," "The Wicked King," and "The Queen of Nothing." It explores themes of ambition, identity, and the complexities of love and loyalty, as Jude strives to prove herself in a realm that often looks down on humans.