Create a cinematic, moody eBook cover featuring Victorian London at night, cloaked in thick fog. A shadowy figure of Sherlock Holmes stands in the foreground, wearing a long coat and deerstalker hat, facing a dark alley lit by a dim gas lamp. In the background, show silhouettes of beggars, children and adults alike, lining the cobbled streets—some watching, some hiding. Add a sense of danger with subtle symbols of underground crime—a hidden dagger, blood-stained coins, or a torn charity banner fluttering in the mist. The palette should use dark tones, foggy greys, and muted yellows from the streetlights. The mood should blend mystery, suspense, and urban grit.