From the publisher:
A cathedral is a prayer in stone, a vaulted hymn of masonry and devoted labour. The great cathedrals are symbols of the great faith of the people and the power of the Church.
Soon, they will burn. Madness and misrule are loose upon the world, and only the assassin-monks of the secret Order can set things right again. From the Champagne Fair at Troyes to the uttermost depths of the Earth, the hunt is on - but who is the hunted, and who is the hunter, in a time when all law and even sanity itself is overturned.
Ex Cathedra is a series of three linked adventures for Deus Vult.