The investigation into how 39 Vietnamese immigrants died in the back of a lorry in Essex.

How a gang posing as workmen stole enough electricity to power dozens of cannabis farms.

Police must determine whether a fatal collision was an accident or deadly driving.

How the search for a vulnerable young woman unravels a tragic case of neglect and murder.

The Flying Squad hunt for a brazen gang of thieves stealing jewels and cash across the UK.

How an investigation into illegal cigarettes worth millions in Wales saw a gang jailed.

How the brutal murder of a pensioner was solved, thanks to DNA.

How the online brags of a drugs gang exploiting teenagers led to their downfall.

Police are left shocked when a suspect confesses to far more than they expected.

Would CCTV of a change of clothes unlock the truth about the murder of a loved son?

Healthcare workers are caught unlawfully drugging their patients on a stroke ward.

How a specialised unit uncovered the biggest prison smuggling conspiracy in UK history.

The dogged detective who caught a romance fraudster who stole £250K from multiple victims.

The dramatic takedown of an international network smuggling people into and out of the UK.

How a blackmailer using the dark web was caught at his unassuming home in Mold.

The astonishing fraud involving fine wine, the FBI and £1M of gold.

After a much-loved family man is killed in his home, police must find those responsible.

The chilling case of how a mass murder plot was foiled, thanks to a routine police visit.

When South Wales Police are handed a lost phone, it leads them to a huge discovery.

How the killer of Sarah Crump was convicted 30 years after being cleared of her murder.

Police dismantle an organised crime group using trafficked women in Glasgow brothels.

How a gang were sentenced to 88 years for laundering drugs money into cryptocurrency.

Police in Fife are on a cat-and-mouse chase to catch a dangerous criminal.

Police find a body in Neath – but was this an accident, or is it a murder?

The chase to catch the gang boss enrolled as a student in Swansea as a cover to sell drugs