Read the passage: "The old mansion stood shrouded in ivy, its windows like vacant eyes staring out from beneath heavy, drooping eaves. A perpetual twilight seemed to cling to its decaying facade, and the only sounds were the whisper of the wind through broken panes and the distant, mournful cry of a lonely owl. Locals whispered tales of its former inhabitants, of fortunes lost and spirits lingering." What is the overall tone of this passage?