Since the mood is determined by how the reader might feel while reading a story, one might feel nervous for Frampton Nuttel as he waits to meet strangers with letters of introduction from his sister. While waiting for adults to arrive, a 15-year-old tells him of a tragedy that struck the family three years prior to his visit. This news would cause one to feel concern for the family Nuttel is visiting. As the girl reveals the story behind a hunting accident allegedly involving her uncle and two cousins, the mood seems tragic and creepy because her Aunt leaves the window open for their possible return. The author's tone seems serious because he's setting the reader up for the twist at the end, just as the girl sets up Nuttel.
When the aunt finally does meet Nuttel, she is cheerfully talking about her husband and boys out hunting, which causes confusion. Yet as the men return, the tone of the story seems grave in order to keep the reader wondering if the men really are hurt or not.
"In the deepening twilight three figures were walking across the lawn toward the window; they all carried guns under their arms, and one of them was additionally burdened with a white coat hung over his shoulders. A tired brown spaniel kept close at their heels. Noiselessly they neared the house, and then a hoarse young voice chanted out of the dusk: 'I said, Bertie, why do you bound?'"
Rather than stay to see the outcome, Nuttel hightails it back to where he came from, leaving the reader probably feeling duped just as Nuttel was.