In 1187, on the day of her wedding, the beautiful 15-year-old Esclarmonde scandalizes the court when she refuses to accept the knight chosen by her father, the lord of the domain of Whispers. She defies her father's wishes and vows to give herself to God, for which he imprisons her in a cell adjoining the castle's chapel. Instead of the peaceful solitude she sought, Esclarmonde finds in her cell the crossroads between the living and the dead. Walled in, with nothing but a single barred window to connect her to the outside world, Esclarmonde nevertheless exerts a mysterious and pervasive power over the kingdom. The virgin sorceress reaches a saint-like status, and men and women journey from far and wide to hear her speak. Esclarmonde even persuades her father to wage war in the Holy Land, resulting in a massacre of staggering proportions.