The Castle of the Djinns, 1176 AD. Two millennia have passed since the four Archons abandoned Egypt and each other and scattered into the world. But now events in the Holy Land draw them together once again. From Antioch to sacred Petra, a knight and a mysterious young woman joined by a writer named Chrétien de Troyes embark on a dangerous quest for the runestone used by Moses, and the origins of the Holy Grail.