Mysterious investigator, 1920s, male, dark suit, white shirt, black tie, fedora hat, trench coat, detective's magnifying glass, eerie atmosphere, dimly lit study, old leather-bound tomes, scattered papers, mysterious artifacts, ancient runes, creepy tentacles, Sanity-blasting horror, eerie green glow, foggy London streets, Victorian-era architecture, gas lamps, rainy night, cinematic lighting, 3/4 composition.