The mystery of Rennes-le-Château finally revealed?...Constant must face determined enemies who do not hesitate to eliminate an abbot who has come to ask him for some information. The disturbing singer Emma Calvé is at their head. She is determined to recover the painting while a young thief tries to take advantage of the mess. There this remains secret hidden somewhere on a canvas. Initiates claim that it would give power inherited from the devil himself. The mystery could be unraveled in an isolated village in Languedoc, Rennes-le-Château.