From publisher blurb:
Behind Iron Doors, a Gateway to Doom!
Paris, 1895. A sensation-seeking band of art students confronts supernatural invasion from an alien realm. A play called The King in Yellow circulates in the city’s secret, decadent circles, twisting the ordinary and corrupting the sacred. In the students’ latest case, a fellow student’s disappearance draws them to the Notre-Dame Cathedral. Legend claims that its iron doors were sculpted through a pact with the devil. Behind this tale the investigators uncover a stranger truth, replete with hooded figures, an unearthly plague, and the terrifying creatures that inspired the gargoyles.