The Secret of Jack O'lantern (The Sherlock Holmes Halloween Special, Episode 4‪)‬

The fourth corpse led Holmes and Watson to a hospital. The nurse Nancy Rogers had been killed in the same manner as her predecessors. Around her body now stood only two pumpkins. The evening thereafter, Watson had another of those terrifying dreams. When he finally awoke, he was able to present Holmes with a gift from the Devil himself. And this present pointed to only one possible perpetrator...