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When an unconscious man is stamped on, there's no CCTV. But can a footwear specialist looking at the bruising on the body help identify the shoes worn by the killer?
A fatal house fire turns suspicious two years on when it emerges the victim was visited by a stranger the night his home was destroyed. Will a plane ticket give a moment of proof?
When a child goes missing, police have few leads. They have a suspect but not enough evidence to prove anything. Eventually, a torn-up cheque gives them their moment of proof.