The investigation of Steve Hodel is more than convincing. Throughout the streets of almost 800 pages he dissects us a news unsolved, and we reveal the hidden face of the police of Los Angeles 40s Corruption, crime, sex scandals, everything is there. With cold objectivity Hodel stands us a portrait of his father, impressive and awesome, and that of the murderer of Dahlia, perverse and player, and suddenly many of evidence and exhibits shows us the workings of an investigation strangely conducted, remained unresolved for more than 50 years. If sometimes the abundance of elements may seem daunting and long, it is only to better inform the reader.