The Languedoc Trilogy is a series of historical novels written by author Kate Mosse. Set in the region of Languedoc in southern France, the trilogy consists of three books: Labyrinth, Sepulchre, and Citadel. Each novel intertwines past and present narratives, exploring themes of love, betrayal, and the search for truth. The stories are rich in historical detail, often referencing the Cathars, a religious group that faced persecution in the 13th century. The trilogy combines elements of mystery and adventure, drawing readers into the enchanting landscapes and complex histories of the Languedoc region.