A special horse named Hosanna changes the lives of two English brothers and those around them as they fight with King Richard I against Saladin's armies during the Third Crusades.

Using principles of their shared Muslim faith to persuade him, an agent of the Old Man of the Mountain convinces Kamil to lead Will and Ellie into a trap, but Kamil repents and seeks a way to save his friends and redeem himself.

As the conflict in Languedoc, also called Occitan, intensifies, Raimon, having escaped the pyre, suppresses his longing to find his beloved Yolanda and, together with Parsifal, carries the Blue Flame to the mountains where it serves to rally loyal Occitanians to organize against the formidable French forces set to invade their beloved country.