The Gemma Doyle Trilogy is a series of young adult fantasy novels written by Libba Bray. It follows the story of Gemma Doyle, a young girl in the late 19th century who discovers she has magical powers. The trilogy includes three books: A Great and Terrible Beauty, Rebel Angels, and The Sweet Far Thing. The narrative explores themes of friendship, identity, and the struggle between good and evil. Set in a Victorian boarding school, the series combines elements of historical fiction with fantasy. Gemma and her friends navigate the complexities of their lives while uncovering the mysteries of the Realm, a magical world connected to their own. The trilogy has received critical acclaim for its rich storytelling and character development.