Create a book back cover illustration that seamlessly extends the dark

Create a book back cover illustration that seamlessly extends the dark, mysterious medieval theme established on the front cover. The scene takes place in the courtyard of a castle, under the same stormy, cloud-covered night sky, with deep blues and purples dominating the color palette. The moonlight, filtered through the clouds, casts a soft, eerie glow over the cobblestone ground. In the foreground, there is a weathered stone well, with ivy creeping up its sides, and a small cluster of blue thistle flowers, their vibrant blue and violet hues providing a subtle pop of color amidst the muted tones. The courtyard is surrounded by tall, ancient castle walls, and a large, wooden door on one side is slightly ajar, hinting at hidden secrets or mysteries beyond. The overall atmosphere is quiet, eerie, and introspective, with gentle shadows adding depth to the scene. The book’s synopsis is centered on the back cover, written in an elegant Gothic-style font that matches the front cover. A simple medieval border frames the text, keeping the design cohesive and aligned with the artistic style of the front.

Avoid using bright, modern colors or overly cheerful tones that would disrupt the dark, medieval atmosphere. Do not include any characters, animals, or modern elements like cityscapes or technology that would break the period setting. The scene should not be overly dark to the point where details are lost, and the design should avoid clutter with too many elements. The font for the text should remain clear and elegant, avoiding overly ornate styles that could make the synopsis difficult to read. Stay away from overly fantastical elements that do not fit with the subtle, mysterious tone of the overall design.