Design a book back cover that evokes a sense of mystery and introspection

Design a book back cover that evokes a sense of mystery and introspection, set against the backdrop of a medieval European castle. The scene is focused on a large, arched window with stone framing, through which a starry night sky is visible. The window overlooks a dark forest at the edge of the castle grounds, with the faint outline of trees under the moonlight. Below the window, an old wooden table is visible, with an open, ancient book lying on it, its pages slightly fluttering as if a breeze has passed. A single blue thistle flower rests beside the book, adding a subtle touch of color. The atmosphere is quiet and contemplative, with the soft glow of the moon casting gentle shadows across the scene. The book’s synopsis is placed above or below the window, with a clear, elegant font that matches the medieval theme. The overall color scheme uses deep blues, grays, and hints of silver, to maintain the mysterious and somber mood.

Avoid any bright or vibrant colors that could clash with the dark, introspective theme. Do not include any characters or living creatures that could take focus away from the setting. Avoid using modern or futuristic elements, such as electronic devices or contemporary furniture. The scene should not be overly busy or cluttered with too many details, and the font for the synopsis should be legible and not overly ornate. Steer clear of including any overly dramatic or fantasy-like elements that do not align with the subtle, mysterious tone of the design.