Jack the Ripper. The Most Intelligent Killer in History presents the conclusions of more than 5 years’ research by the graphologist Don José Luis Abad y Benítez. Every year dozens of books about Jack the Ripper are published. All of these work with hypotheses or fiction; but finally the greatest criminological mystery of all time has been solved: the true identity of Jack the Ripper. This is not hypothesis or conjecture, the author gives proof (calligraphic investigative report) of the surprising identity of the famous criminal: Jack the Ripper was Inspector Abberline, the Scotland Yard inspector in charge of the investigation of Jack the Ripper’s crimes… the crimes that he himself committed.