When a Crusade is called by the Pope to regain Jerusalem for Christianity, Casca finds himself drawn into the campaign thanks to him agreeing to assist a helpless French noblewoman.
What Casca is initially unaware of, however, is that the noblewoman, Giselle de Doumanche, is carrying an ancient relic that she dare not reveal for fear of it being destroyed by some of those on crusade.
To make matters worse the crusade attracts the attention of the Brotherhood of the Lamb and eventually Casca has to confront his arch enemies who are sworn to inflict on him every punishment they possibly can.
But Casca knows a secret that could possibly tear the Brotherhood apart, a secret he planted under the floor of a church in Antioch centuries before, and Antioch is on the direct route the crusaders will take on their quest to the Holy City.
