"Lourdes" by Émile Zola is a novel published in 1894, the first part of his "Three Cities" trilogy. Father Pierre Froment, a Catholic priest experiencing a profound crisis of faith, joins a pilgrimage to the famous sanctuary of Lourdes with his childhood friend Marie de Guersaint, who hopes for miraculous healing. Through Pierre's observant eyes, Zola examines the fervent religious devotion of pilgrims, the commercialization of the sacred site, and the boundary between faith and medical explanation in reported miraculous cures.