The chilling case of how a mass murder plot was foiled, thanks to a routine house call by officers in which they discovered an arsenal of weapons, ammunition and a kill list. And how an audacious drug gang dressed as fake cops to hide their identities as real robbers.

After much-loved family man Mark Noke is killed in his home in Southampton, the police investigation reveals plans for a complex heist gone tragically wrong. Also, the gang selling fraudulently obtained passports to Britain's most wanted criminals.

The cat-and-mouse chase to bust a gang who enrolled at Swansea university in order to sell drugs to students. Plus a twisted case of revenge. Why did a man who was attacked with a machete in Cardiff refuse to cooperate with the police? When a shooting happens on the streets, detectives finally find a link, but, bizarrely, it takes a visit to the x-ray department of the local hospital to finally find the unusual hiding place for the gun.

When detectives investigate a wine investment scam, they uncover a breathtaking story of deception involving £1 million worth of gold bars, the FBI and a suspect who thinks he’s got away with it. Also, how fake art was sold to the elderly as an investment when it was worth nothing at all.

How the National Crime Agency bust an international network smuggling people in and out of the UK using a fleet of taxis and lorries. And a determined officer sets off on a Europe-wide chase to arrest a gang of thieves terrorising his community.

Police dismantle an organised crime group using trafficked women in brothels across Glasgow. Plus a look into the Crimewatch archives to see how police caught the murderer of Suzanne Pilley.

The detective who caught a romance fraudster who stole nearly £250K from victims while posing as a wealthy property developer. Also, a jaw-dropping rooftop chase to arrest a shameless courier fraud gang who would stop at nothing to con their victims out of their cash.

How a determined police force took down the gang selling industrial amounts of cocaine and laundering their profits through multiple cryptocurrency accounts. Plus the solicitor stealing his clients' money.

How a prison worker who smuggled contraband into jail for her lover led to police uncovering the biggest prison smuggling conspiracy in UK history. Also, the race against time to find the person responsible for a chilling stabbing of a homeless man on the streets of London.

When a man confesses that a woman is lying dead in his house, police must establish whether she died as a result of an accident or if she was murdered. There is also a look into the Crimewatch archives. Detectives and forensic experts describe how Pembrokeshire killer John Cooper was finally found guilty of murder, decades after he committed his crimes. Advances in forensic technology finally helped police crack these two infamous double murder cases.

After a phone is left behind at the scene of a minor car crash in Cardiff, police go on to unravel a huge drugs conspiracy. And we go into the Crimewatch archives to see how the cold-hearted killer of Tati Rogers was eventually caught thanks to an elaborate double bluff set by the police in Wrexham.

When a violent burglar ties up a homeowner in Dunfermline, it would take a team of dedicated officers two and a half years before they could finally catch him. And how a body builder in Falkirk was selling diet pills despite knowing they could be fatal.

How former healthcare workers who were unlawfully drugging patients on a hospital stroke ward, and then bragging about it, were finally caught thanks to a determined detective. And the dramatic arrest of the man responsible for stabbing a doctor on his doorstep.

How a blackmailer using the dark web to buy personal details so he could blackmail people was finally caught in his home in Mold. Plus the detailed police investigation that smashed a gang of thieves based in Swansea, Neath and Port Talbot.