In the early 1950's John Christie murdered six females in London's Notting Hill. His victims were prostitutes, a neighbour and her baby daughter, and his own wife. One innocent man went to the gallows before Christie was finally caught and sentenced to death for his five-year run of murder.

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Thirteen years earlier it took Richard Speck only one night of horror to kill eight women in Chicago. He forced his way into a nurses' home and systematically murdered them, one by one.

Only one nurse escaped and she identified the killer, ensuring that he received the longest prison sentence in American legal history.

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In the same city, twenty years earlier, three more females had lost their lives. Their murderer was only 16-years old at the time of his first attack.

He was William Heirens, a violent youth who wandered the streets looking for someone to burgle. He broke into women’s apartments, killing them, and then cleaning the apartment and the body. His last victim was a six-year-old girl whose body he dismembered before throwing it into the Chicago city sewerage system.