7. Jack the Ripper
In 1888, five prostitutes have been brutally murdered as a part of serial killing. Killer cut down their throats, abdominal and took out their internal organs. The way victims has been killed suggest that the killer may have anatomical or surgical knowledge. At the time of investigation, police and media received many letters supposed to be from the murderer itself with the name of Jack the ripper. But who was he and why targeted only prostitutes? These are the questions never answered.