Lord of Mysteries is a Chinese web novel series set in a steampunk-inspired world mixing mystery, occultism, and supernatural powers. It follows Klein Moretti as he navigates secret organizations, tarot-like paths, and hidden forces while uncovering the truth behind a strange new reality. The story is known for its intricate worldbuilding, layered plot, and gradual escalation from investigation to cosmic-scale conflict. It has inspired adaptations and is commonly referred to by its English title in international usage.