Why would a man, married to an attractive young woman, want to sexually assault and murder innocent little girls?
In the late 1960s, Cannock Chase in Staffordshire became the centre of the biggest murder hunt in Britain.
The bodies of five year old Diane Tift, six year old Margaret Reynolds, and seven year old Christine Darby were found dumped there.
The killer thought he was cleverer than the police and slipped through the net four times.
He would have continued with the killings but he made a big mistake.
Find out what happened and how the police eventually caught up with him.