An all-star cast including Jessica Brown Findlay, Tom Felton, John Hurt, Sebastian Stan and Vanessa Kirby head up Kate Mosse's best-selling adventure thriller adapted by Adrian Hodges. The two intelligent headstrong heroines, 17-year-old Alaïs Pelletier from 13th century Carcassonne and modern-day PhD graduate Dr. Alice Tanner experience an adventure that intertwines their lives. Separated by time, but united in a common destiny, Alice inherits a house in the South of France from an unknown aunt and is haunted by dreams of a woman from the past. Compelled to find out more, Alice stumbles upon an archaeological find that will bear witness to a genocide committed 800 years ago on European soil, which will lead her to the secrets of the Holy Grail.