The series follows two women-medieval Ala�s Pelletier du Mas (Jessica Brown Findlay), who lives through the Crusades and Cathar massacres in medieval France, and modern-day Alice Tanner (Vanessa Kirby)-in their quest to find the Holy Grail.[1] Alice, a volunteer at a French archaeological excavation, discovers the skeletal remains of two people in a cave, as well as a labyrinth-engraved ring, which attracts the attention of unscrupulous individuals. In 1209, newly married Ala�s is living in Carcassonne, a stronghold of Cathars who have been declared heretical by the Church. Ala�s and her father are protecting three sacred books that reveal the secret of the Holy Grail from the Crusaders.