The Lux Series is a popular young adult science fiction series written by Jennifer L. Armentrout. It follows the story of a teenage girl named Katy Swartz, who moves to a small town and discovers that her neighbor, Daemon Black, is an alien with extraordinary powers. The series explores themes of love, friendship, and the challenges of being different. The series consists of five main books, starting with "Obsidian," and includes several novellas that expand on the characters and their adventures. The Lux Series has gained a dedicated fanbase due to its engaging plot, relatable characters, and a mix of romance and action, making it a favorite among readers of the genre.