Something is haunting the Louvre, seeking the fabled “Treasure of the King of France”, which is supposedly hidden somewhere in the famous museum. People believe that it is a ghost, but others aren’t so convinced.
The comics about Belphegor are :
Belphegor
by Arthur Bernède
(“Les Romans Mystérieux”, Tallandier, 1927).
Le Mystère du Louvre (The Mystery of the Louvre)
De Mystère en Mystère (From Mystery to Mystery)
Le Fantôme Noir (The Black Ghost)
Les Deux Polices (The Two Polices)