Katie's Diary is a unique analysis of the diary left behind by a young woman who has committed suicide. As compared to suicide notes, which are typically brief, Katie's diary consists of five separate books, an opportunity to look into the mind of a suicide from a source of data that is extraordinarily rare.

Commenting on the diary are professionals in the fields of suicidology, linguistics, women's studies, Jungian analysis and voice therapy, among others.

Suicidal themes that prevail in her writing are discussed, as well as potential treatment methods in the hopes that the study will contribute to suicide prevention.