An aspiring writer goes to work on a cell phone commercial starring Gary Oldman while obsessing about the movie "Syd and Nancy" while dealing with his social worker girlfriend and her marginally famous sister.
Gary Oldman is a Building You Must Walk Through is a building you must walk through, or book, or should. The same could then be said of "Sid and Nancy," only substituting "movie" for "building" (or "book"). I know I did!