A dramatic and atmospheric professional book cover artwork for a mystery-thriller novel. Central imagery features a colossal, ancient, leather-bound medieval manuscript slightly open, emanating a faint, eerie, ethereal golden light from within its pages. The background is a moody, blurred gothic library interior with tall arched windows, swirling dust motes in shafts of moonlight, and dark shadows. Color palette: deep obsidian, charcoal grey, tarnished gold, and accents of cold, pale blue. The lighting should be high-contrast, cinematic, and intense, emphasizing texture on the aged parchment and leather. Composition: centered, balanced, dark academia aesthetic, highly detailed, photorealistic, no text, no letters, no words, 1024x1024 square format.