"The Iron Knight" is the fourth book in the popular Iron Fey series by Julie Kagawa. It follows the journey of Ash, a former prince of the Winter Court, as he seeks to become human for the love of Meghan Chase, the series' protagonist. The story combines elements of fantasy, romance, and adventure, set in a richly imagined world of faeries and mythical creatures. In this installment, Ash embarks on a quest to find the Iron Fey, a new breed of fae that represents the modern world. Alongside his companions, including Puck and Meghan, Ash faces numerous challenges and battles against powerful foes, ultimately exploring themes of love, sacrifice, and identity.