"The Iron Fey" is a young adult fantasy series written by Julie Kagawa. It follows the story of Meghan Chase, a teenage girl who discovers that she is the daughter of a faery king. As she navigates the magical world of Faery, she encounters various creatures, including fey and iron fey, who are a new breed of faeries created by human technology. The series explores themes of identity, love, and the conflict between nature and technology. It consists of several books, starting with "The Iron King," and features characters like Ash, a prince of the Winter Court, and Puck, a mischievous faery.