The speaker remembers stealing one old leather book from a crumbling castle she loved, shortly before a fire destroyed the building. Nothing was left but a stone shell, which was bulldozed and replaced by a garage. Now she regrets not taking everything: the books, the glass, the candlestick, the organ, even the bell and the porch railing where people once sat, sang, and kissed.
The poem's tone shifts from storytelling to a plain, searching question: "What is this about?" Her answer is a long list of reasons, about caring for places, fearing change, and believing history matters. The list of objects grows longer and more ordinary, ending with shoes, razors, drums, and "books that no one will ever read." The mood is wistful and a little rueful, but also tender. She isn't claiming these things are valuable. She is saying that the everyday leftovers of lives are what make the past feel real, and that losing them hurts.