As against other details made me wince:
1) Was it necessary to trace the career and life of Eliot Ness from beginning to end? ; I do not believe it, it's a little heavy and it distracts us about the book.
2) In the hall to the front door of the duplex Georgette Bauerdorf, police noticed that the lighting of the ceiling no longer works. We were given two laps to screw the bulb so that the switch can no longer light up. It is essential to be very large to unscrew a light bulb located at 1.90m from the ground? ; I do not believe him.
3) Stéphane Bourgoin points to a strange coincidence of fate: Elizabeth Short (aka the Black Dahlia) was born in Medford, Massachusetts, and his supposed killer lived, worked and was arrested in Medford in the State of Oregon. This remark is not serious!
4) Contrary to what the subtitle of this book, the riddle is not solved finally!
At the end of the book discloses the reader the identity of the killer if desired. With this book, Stéphane Bourgoin does not claim to absolute truth but to have an updated presumptions which all tend towards the same individual.
Finally, some photos are hard to bear, especially for me, those children killed in page 186.
Despite these few criticisms I issue, this book is easy to read and somewhat frantically as you hurry to discover the identity of the killer and the undeniable evidence of his guilt (I've eaten in 4 days).