A yacht is tracked by police as an organized crime gang uses it to smuggle deadly weapons into Britain and a recording of a prison phone call helps jail a bank cashier for arranging to steal an elderly couple's life savings.

A discarded cigarette butt gives police the proof they need to find the murderers of a young father shot and killed in broad daylight. A used match found in a drainpipe identifies a arsonist who burnt a 400-year-old building to the ground.

An airport hire car provides the clues to the identities of a pair of South African hitmen who have come to the UK to brutally murder a private investigator in his home. A rare bottle of Caribbean rum helps convict a prolific burglar.

A train ticket and a chance encounter help hunt down a pair of hi-tech international fraudsters with links to the Russian underworld. A glass milk bottle gives police the evidence that seals a case against a violent offender.

A bloodstained shopping trolley holds the key to solving the case of a vicious assault. A distinctive pair of curtains, seen on a video call thousands of miles away, helps put a phone thief behind bars.

A drug boss is put behind bars thanks to a paper trail from his dodgy property empire. A bank cashier helps convict a fraudster who's posing as a police officer, exploiting a vulnerable pensioner in a scam to extort thousands of pounds.

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