I saw an absolutely fantastic film on Fox Classics on Friday. It was called "The Letter" and was the perfect film to link in with the Big Sleep. It had elements of the Country House genre, (ties with Real Inspector Hound) but was filmed in America (links to the Big Sleep) AND it is a courtroom drama (links to Snow Falling on Cedars)
Not sure how it would link to Skull beneath the skin. Out school doesnt do that text.
For my half-yearlies, as huy said, I just did the Mousetrap and linked it to Real Inspector Hound (actually, more like contrasting).