Writing a Book as Circumstantial Evidence

I am currently reading Helter Skelter: The True Story of the Manson Murdersby Vincent Bugliosi and Curt Gentry. The book is about the Manson Family murders, which is a moniker that sounds gaily sing-songy compared to just how nightmarish those events were. Charles Manson and the group of people he had brainwashed slaughtered around eleven people over the course of a few months in the summer of 1969.

The book is considered the definitive work on the Manson murders. This is not surprising as the...