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A passenger on a London-bound train notices something deeply disturbing on another traveller’s phone. And across the Fens, officers investigate a series of high-value vehicle thefts.

A missing person investigation goes from a kidnapping to something more sinister. In Hertfordshire, officers pursue a predator who's targeting elderly victims at cash points.

A woman preparing for a Christmas night out is brutally stabbed in her own home. And detectives pursue an international burglary gang who are raiding affluent Surrey homes.

A dead body is found in a North Wales nature reserve, revealing a deeply disturbing and sinister murder in the family. And a high-end crime gang is running loose in West Mercia.