|This two-night event spawns a period from 1209 to 2012 as the lives of modern-day graduate student Alice Tanner becomes interlinked with that of Alais Pelletier Du Mas, a young woman born in Carcassone, France. Alais is destined to become a Guardian of the Grail, a collection of three Books which hold the secret to immortality.|
In the 13th century, the Crusaders lay siege to Carcassone to wipe out the Cathar heretics. While Alais and the townspeople attempt to defeat them, in the modern day Alice is plagued by visions of Alais' life 800 years ago. she also finds a ring bearing the sign of a labyrinth in an ancient cave. The cave is sought by a secret society who believe that they can use the ring to find the Grail and grant themselves immortality and the power that comes with it.
While Alice struggles against the society's intrigues in the present day, in the past Alais attempts to escape Carcassone despite her older half-sister Oriane's efforts to find the books and take power for herself. In the end, the two stories intertwine as Alice comes to the cave and learns the true secret of the Grail.