Quand le Dogme chassa la Lumière Tome 1
[978-2-35291-084-8]

A descendant of Hugues de Troyes, the Duke of Champagne and one of the founders of the Templars' Order, Enguerrand de Massicourt, the cadet of his family, is doomed to become a  cleric. He is suddenly summoned back to the family castle from Saint-Héribert's Abbey where he is studying with its monks. Philippe, his elder brother, has just been killed in a tournament at the court of the count of Orléans.
His father's will is to have Enguerrand dubbed a knight so as to become a Templar. In that aim, he is to ride down unto the south of France so as to meet his cousin, Hugues de Saint-Arnaud, the commander of a Templar preceptory in Vaour, in an oc-speaking country.
In 1243, this province has become the prey to a crusade which Pope Innocent III and  Louis IX, the King of France, have let loose against the so-called Cathar « heretics » who merely call themselves Good Christians. Received as a wandering guest, then cured and healed in Gaja-la-Selve, the land house of the Maury family, Enguerrand discovers at the same time the Good Christians' utter simplicity and dignity and the Roman Church duplicity.
After numberless adventures entailed by his endeavours to meet his elusive Templar cousin, Hugues de Saint-Arnaud, Enguerrand – who feels he owes a debt of honour to the Maury family – does at last rejoin his friends in Montségur where they have fled so as to escape persecutions. While deepening his knowledge of and his esteem for the Good Christians, he plays his brave part in the defence of the fortress until its reddition on March 16th, 1244, surrender that is to end up in the horror of the funeral pyre of his Good Christian friends.