July 2005. Within the Pyrenees mountains close to Carcassonne, Alice, a volunteer at an archaeological dig, stumbles right into a cave and makes a startling discovery-two crumbling skeletons, unusual writings on the partitions, and the sample of a labyrinth.
Eight hundred years earlier, on the eve of a brutal campaign that may rip aside southern France, a younger girl named Alais is given a hoop and a mysterious e-book for safekeeping by her father. The e-book, he says, accommodates the key of the true Grail, and the ring, inscribed with a labyrinth, will determine a guardian of the Grail. Now, as crusading armies collect outdoors the town partitions of Carcassonne, it is going to take an incredible sacrifice to maintain the key of the labyrinth secure.