This work investigates the psychological and social mechanisms that enabled Charles Manson to manipulate his followers into committing a series of brutal murders in 1969. Vincent Bugliosi, the lead prosecutor in the Manson trial, utilizes his firsthand experience and extensive trial records to construct a comprehensive account of the investigation and subsequent legal proceedings. The book argues that the Manson Family was not merely a collection of criminals, but a cult-like structure driven by Manson's apocalyptic ideology and psychological control.

Experts and legal scholars frequently cite this book as a definitive account of the Manson trial and a foundational text in the true crime genre. Readers often note the meticulous detail and the dense, procedural nature of the prose, which reflects the author's background as a prosecutor.