A young couple living in a large isolated house 
                          went out to a dinner party one evening and left 
                          the baby-sitter in charge of their two children. 
                          The children were put to bed and the baby-sitter 
                          was watching the television when the phone rang. 
                          She answered, all she heard was a man laughing 
                          and then a voice saying, "I'm upstairs with the 
                          children, you'd better come up." Thinking it was 
                          "one of those phone calls" or a practical joke 
                          she slammed down the receiver and turned up the 
                          television. A short time later the phone rang 
                          again and, as she picked it up, the unmistakable 
                          hysterical laughter came down the line and the 
                          voice again said "I'm upstairs with the children, 
                          you'd better come up." Getting frightened she 
                          called the operator and was advised they would 
                          notify the police and should he phone again, if 
                          she could keep him talking in order to give them 
                          time to trace the call and have him arrested. 

                          Minutes after she replaced the receiver the phone 
                          rang again and when the voice said, "I'm upstairs 
                          with the children, you'd better come up," she 
                          tried to keep him talking. However, he must have 
                          guessed what she was trying to do and he put the 
                          phone down. 
 
                          Seconds later the phone rang again, this time it 
                          was the operator who said, "Get out of the house 
                          straight away, the man is on the extension." The 
                          baby-sitter put down the phone and then heard 
                          someone coming down the stairs. She fled from the 
                          house and ran into the arms of the police. They 
                          burst into the house and found a man with a large 
                          butcher's knife. He had entered the house through 
                          an upstairs window, murdered both the children 
                          and was about to do the same to the baby-sitter.