Cardan Greenbriar's World is a fictional realm from the book series "The Cruel Prince" by Holly Black. It is set in the enchanting yet treacherous land of Elfhame, inhabited by Fae and other magical creatures. The world is characterized by its lush landscapes, intricate politics, and the constant struggle for power among its inhabitants. The story follows Jude Duarte, a mortal girl who navigates the complexities of life in Elfhame after being raised in the Fae court. Themes of betrayal, ambition, and identity are central to the narrative, as Jude seeks to carve out her place in a world that often views mortals as inferior.