A gritty, noir-inspired illustration for an audiobook cover. The central image is a silhouette of a lone figure walking down a dimly lit, rain-slicked urban alleyway at night. Shadows are deep and elongated. Hints of neon signs from distant buildings cast an ominous red and blue glow, reflecting in puddles on the ground. The atmosphere is tense and mysterious, with a sense of impending danger. The overall mood is dark, suspenseful, and slightly melancholic. The composition should be dramatic, drawing the viewer into the scene. Visual style is a high-contrast, almost graphic novel aesthetic with a focus on light and shadow. Aspect ratio 1:1.