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In 2025, archivist Ellen MacKenzie discovers a forgotten, red-stained Sherlock Holmes manuscript within the Cambridge University Library that reveals a chilling, prophetic investigation from 1857. The story follows Holmes and Dr. Watson to the Scottish Highlands, where they encounter the legendary 'bleeding mountain' of Ben Macdhui. While locals fear supernatural curses and the phantom Grey Man, Holmes uncovers a biological phenomenon linked to industrial pollution. As the Great Detective consults with leading Victorian scientists, he deduces a terrifying reality: humanity's industrial progress is inadvertently triggering a global greenhouse effect. Grappling with an existential dread far beyond his typical criminal cases, Holmes documents a grim future for the planet. This atmospheric mystery blends historical fiction with ecological suspense, portraying a melancholic Holmes who confronts a catastrophe that logic alone cannot solve, ultimately left for a modern researcher to reveal to a world now living in its shadow. Comparable works include The Seven-Per-Cent Solution