Katie was four when her mother gave her up. Katie is a bright girl on the high end of the autism spectrum. The only memories she has are in her "Stack of Stories" notebook. When Katie spends the summer in Lunenburg, Nova Scotia with her foster mother, the connection she feels to this historic town makes Katie determined to find out about her past. Befriending locals like Aggie, an older woman, who shares a series of letters sent by a young girl who arrived in Lunenburg in 1752, and Aggie's sister, a reclusive eccentric who lives in the woods, help Katie to find clues to her own past. She can't help feeling that she has found her true roots.