A mysterious, high-contrast, noir-inspired illustration for a classic detective novel. The composition features a silhouette of a woman wearing a vintage 1940s cloche hat and a trench coat, standing under a glowing, fog-shrouded street lamp on a wet, cobblestone alleyway in old Bucharest. In the background, a subtle, blurred shadow of a man following her. The color palette is deep midnight blue, charcoal gray, and muted amber light emanating from the lamp. Cinematic lighting with long, dramatic shadows, moody atmosphere, intricate textures of rain and pavement. High-end professional aesthetic, minimalist, evocative of suspense and mystery. No text, no letters, no words, no title, 1024x1024 square format.