What is the name of the book that Gatsby's father shows Nick after Gatsby's death?

The book that Gatsby’s father shows Nick after Gatsby’s death is *Hopalong Cassidy*.

Henry C. Gatz arrives at Gatsby’s mansion shortly before the funeral and proudly shares a battered copy of the children’s adventure book. He explains that Gatsby owned it as a boy and points to the notes and schedules inside, which reveal the young James Gatz’s intense ambition and self-discipline.

*Hopalong Cassidy* was a popular Western character created by author Clarence E. Mulford. The character became especially famous through later films and television adaptations, but Fitzgerald’s reference reflects the book’s early twentieth-century popularity. Gatsby’s father treats the volume as evidence that his son was destined for greatness long before he became a wealthy host.

Readers sometimes confuse the book with *The Great Gatsby* itself or assume that Gatsby’s father shows Nick a biography. Instead, the worn Western adventure novel functions as a symbol of Gatsby’s youthful dreams and his belief in self-invention.