A professional audiobook cover, square 1024x1024 format, in a dark, atmospheric thriller style. The main imagery should evoke a sense of mystery and psychological suspense. Imagine a lone, dimly lit window in a large, imposing, dark urban building at night. Rain streaks down the glass, distorting the faint light from within. Outside the window, a subtle, almost imperceptible silhouette or shadow is visible, just hinting at a presence. The overall mood should be somber and unsettling, with a color palette dominated by deep blues, grays, blacks, and hints of a muted, sickly yellow light emanating from the window. The composition should be tightly framed, focusing on the window and its immediate surroundings, creating a claustrophobic and voyeuristic feel. The aesthetic should be sophisticated and artistic, conveying depth and intrigue without any text or logos.