This work investigates the true identity and life of the infamous outlaw Butch Cassidy through the personal recollections of his sister, Lula Parker Betenson. The authors, Lula Parker Betenson and Dora Flack, utilize family correspondence, oral histories, and personal memories to challenge the established historical narrative of Cassidy's death in Bolivia. The text argues that Robert LeRoy Parker survived his South American exploits and returned to the United States to live out his life in relative obscurity.

Historians and researchers often view this text as a significant primary source for understanding the personal life of Robert LeRoy Parker, though they frequently note the lack of corroborating evidence for the survival claims. It serves as a valuable counter-narrative to traditional outlaw biographies by providing a familial perspective on a controversial historical figure.