In the story, Jessie discovers an envelope labeled "THE ALDEN CHILDREN" within a box. She eagerly opens it and pulls out a letter that surprises her, prompting a gasp of astonishment. Intrigued by her reaction, Henry inquires about the content, and Jessie shares the letter with him. Benny suggests that it might be from Mr. Carter, who previously expressed disdain for neighbors, hinting at some mysterious context.

Henry reassures the group that they won't be intimidated by the letter or its author, emphasizing their courage and unity. Jessie and Benny quickly agree, while Violet expresses slight hesitation but ultimately concurs. This exchange highlights the bond among the siblings as they plan to confront whatever mystery or challenge lies ahead without fear, setting the stage for their adventures in "The Mystery of the Singing Ghost."