There are 3 books in the Languedoc Trilogy series. The newest book is Citadel which came out in 2014.

July 2005. In the Pyrenees mountains near Carcassonne, Alice, a volunteer at an archaeological dig, stumbles into a cave and makes a startling discovery-two crumbling skeletons, strange writings on the walls, and the pattern of a labyrinth.

Eight hundred years earlier, on the eve of a brutal crusade that will…
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2
Sepulchre

Book cover of Sepulchre

1891. Seventeen-year-old Leonie Vernier and her older brother abandon Paris for the sanctuary of their aunt's isolated country house near Carcassonne, the Domaine de la Cade. But when Leonie stumbles across a ruined sepulchre she uncovers a timeless mystery and a unique deck of tarot cards that seem to hold…

1942, Nazi-occupied France. Sandrine, a spirited and courageous nineteen-year-old, finds herself drawn into a Resistance network in Carcassonne - codenamed 'Citadel' - a group of ordinary women who are prepared to risk everything for what is right. When she meets Raoul, they discover a shared passion for the cause, for…