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A family home is targeted in an arson attack – and two people die. But the matches police found are damp and only give a partial DNA profile. There is nothing to put the main suspects at the scene until an eagle-eyed detective realises there is something wrong with the CCTV footage.

Also, police hunting for a burglar who’s stolen hundreds of thousands of pounds' worth of jewellery get their moment of proof from a distinctive piece of clothing.