Christina Baker Kline said this quote

She has never tried to find out what happened to her family — her mother or her relatives in Ireland. But over and over, Molly begins to understand as she listens to the tapes, Vivian has come back to the idea that the people who matter in our lives stay with us, haunting our most ordinary moments. They're with us in the grocery store, as we turn a corner, chat with a friend. They rise up through the pavement; we absorb them through our soles.