Dreaming the Train Underwater is a novella set in a fictional New Hampshire town. The novella occurs in three parts. The narrator, Lulu, is a woman who looks back on the events that occurred in her ninth year. Those events involve her mother, who has raised her, and her grandfather and cousin, both of whom she is introduced to in the opening chapters of the book. The novella explores issues of family history, connection to place, and a child's loss of innocence.