Alais and her friends attempt to protect the Book of Words from Oriane and Guy, escaping Carcassone and taking refuge in Montsegur. Meanwhile, in the present day, Alice discovers that the Noublesso will stop at nothing to get the Labyrinth ring and unlock the secrets of the Grail.

PhD graduate Alice Tanner and 17-year-old Alais Pelletier from 13th-century Carcassonne experience an adventure that ends up intertwining both their lives. Separated by time but united together by a common destiny, Alice inherits a house in the south of France from an unknown aunt and suffers with dreams of a woman from the past. She discovers an archaeological discovery that will end up bearing witness to a genocide committed 800 years earlier on European soil, which will also lead her to the secrets of the Holy Grail.