It all started with a childhood memory that haunts him to this day. Chief Supt Chris Foster was a young boy when he came back from a family holiday and saw his home had been broken into. "I remember as an eight-year-old being burgled", he recalled. "It was my family home in Barnsley.
We had gone camping for a weekend and we had had a new window frame put in the back of the house - so there was putty and glass and it was wooden.
There was a wooden window sill that had not been painted. "We walked into the house and there were bits and bobs scattered all over it.
I distinctly recall this boot print on the window sill. It was a signal that someone had been in the house. "They had stolen my mum's engagement ring.
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