Trisha and Cathy are helping with a SAG petition calling for the abolition of school uniform. There is a school assembly where Llewellyn introduces a policeman warning of a man who has recently been following schoolgirls in the area. No girl is to walk home unaccompanied until the man is caught. After school Cathy is standing outside the school gates waiting for her brother to walk her home. Unknown to her she is being watched by a man in a parked car. Just as he begins to make a move, Gary arrives and they walk home. The next day Trisha and Cathy volunteer to take a parcel to the Post Office for the school secretary, meaning they miss the last lesson of the day. The same man is waiting outside the school and he follows the girls. They post the letter and do some window shopping. He continues to follow them, unseen. By this time school has finished and Trisha's older sister Carol has been waiting for 20 minutes to walk her home. She panics and goes to see Mitchell, who allows her to phone from the school to see if Trisha has arrived home yet. Trisha is not at home. "To be on the safe side" Mitchell calls the police and within minutes he and Carol are in a police car looking for the two girls. By this time the two girls have split up, with Cathy taking a shortcut home through the park. Mitchell and Carol see Trisha walking home and take her into the police car. Trisha says that Cathy is walking home through the park alone. The policeman says that that is where two of the recent attacks have taken place and that there is not a minute to be spared. Cathy is walking in the park when she notices she is being followed. She starts to run, the man runs after her. Just as he is gaining on her she exits the park and two police cars (one with Trisha, Carol and Mitchell inside) screech to a halt and block off the road. The man is captured. He tells the police he is Cathy's father. Cathy says her father is dead. The next day the policeman comes to the school and tells Mitchell that they caught the prowling man the night before. Mitchell said yes of course they had, he was there! The policeman tells Mitchell that this was a different man and that the first man caught IS in fact Cathy's father!
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