What is an example of symbolism in the novel, Afterward?

The library at Lyng is where Mary is standing in the beginning of the story. It is also where Ned works and where they have the majority of their conversations. The library symbolizes the heart of the house where all the secrets and unknowns converge. It is where Mary simultaneously learns more information about her husband and at the same time becomes more and more confused over the mystery of his disappearance.