Beyond the Wall

The narrator visits his strange friend in San Francisco. They have dinner up in the tower within the house. As they are eating, there is a knocking on the wall that disturbs the narrator. The friend tells him to explore it. They discover there is only the outside behind the wall from which he had heard the sound. The friend explains that he has heard this knocking before and that he was happy the narrator also witnessed it.

Ambrose Bierce

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