Batman connection
Anybody notice the plot twist connection to the Nolan Batman movies. In Werewolf of London, Dr. Glendon finds a rare Tibetan flower which temporarily cures his Lycanthropy (a form of insanity, some would say) / In the Batman movies an extract from the rare Tibetan flower causes intense hallucinations. (a temporary form of insanity) Weird huh.
It's only with the heart that one can see clearly. What's essential is invisible to the eye.