Plot and Themes At heart, the 2009 film follows Holmes and Watson as they investigate Lord Blackwood, a supposed practitioner of dark arts who stages apparent supernatural crimes. The story moves from London’s fog-laced docks to clandestine laboratories and into the heart of a hidden conspiracy involving science disguised as sorcery. Key themes include the tension between rationalism and superstition, the costs of genius, and the ambiguous ethics of power. Rather than a purely cerebral puzzle, the narrative makes Holmes confront physical danger and moral ambiguity, insisting that deduction alone cannot always save the day.