"Wuthering Heights" with the Catherine and Bramwell story.
Although this raises the question, did the DS writers tend to borrow from the books or from the movies?
In the case of the Dr. Jekyll and Mr. Hyde motif, they definitely borrowed from one of the movie versions (I think it was the Spencer Tracy - Ingrid Bergman one) because DS closely copied the set for the laboratory, the round door going out the back, etc.
But there are instances that show the writers' literacy knowledge too -- e.g., Bramwell was named after the real life Bramwell Bronte, brother to Emily, Charlotte, and Anne.