A crime scene with nothing in it. A community that wouldn't talk. A suspect who turned out to be the wrong man. And a seven-year-old girl lying dead beside her father.

The murders of Tony Byfield and his daughter Toni-Ann were Neil's first case as a Senior Investigating Officer. More than two decades on, he still describes it as the most famous of his career. In this episode, he takes Andy through it from the moment the phone rang: what he walked into, why the early breakthrough collapsed, and what it felt like to lead an investigation that a lot of people had quietly written off.

Neil also reveals the parts of this story that never made the headlines. Why Crimewatch turned the appeal down. What a serious case review later concluded about the state's failure to protect Toni-Ann. And the moment the silence finally broke: a march through Kensal Rise, an anniversary appeal, and a single phone call that changed everything.

Then Andy and Neil turn to Operation Trident, the unit this investigation fell under. What was Trident actually set up to do? Why did the killing of a child become so important to it? And if community trust is what cracked this case, what could the police still learn from it today?

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Why did a few hundred masked men appear to be treated more leniently than protesters from groups such as Palestine Action and Just Stop Oil? Were the police scared of the mobs in Dover & Portsmouth? Or was their 'light touch' approach justifiable given the lack of notice for law enforcement? Andy & Neil debate whether this was a case of 'two-tier' policing.

They also explain why arrests at public order events often come later rather than on the day, and what officers can and can't do when protesters cover their faces. Is there already a power that could be used to stop it, or does the law need to change? They also look at whether the intelligence services will be assessing the threat from groups run by far-right agitators such as Tommy Robinson and Danny Tommo; where is the line between public disorder and a national security concern?

Plus Andy & Neil give their reactions to yet another heist in France after millions of pounds of Renoir paintings were stolen from a gallery. Why does this keep happening?

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The Crime Agents is a Global production, available every Monday and Thursday on Global Player, YouTube or wherever you get your shows. Make sure you subscribe so you never miss an episode.

Within hours of 97 Liverpool fans being crushed to death at an FA Cup semi-final at Hillsborough, a story was already circulating: that the fans had done it to themselves. Four days later, The Sun printed an infamous front page - "The Truth" - and a lie that would last 27 years was set in stone. So where did that story come from, and how did it survive decade after decade of official scrutiny?

Andy and Neil are joined by LBC presenter Shelagh Fogarty, who was a journalistic apprentice in Liverpool in April 1989. She describes the day itself: the hundreds of Liverpool families who set off across the Pennines with no way of knowing whether the people they loved were alive or dead, and the furious supporters who made it home and went on the airwaves in an attempt to stop the smear campaign against them.

Together they unpick how the cover-up began almost immediately, who gained from it, and the role the media played in carrying it. They examine the case of David Duckenfield, the newly promoted Chief Superintendent commanding his first big match, and why families believe the system failed to hold anyone to account. They also ask what the disaster changed in football, in policing, and in how the British state behaves when it's caught in a lie. Ninety-seven people were unlawfully killed. Nobody has ever been convicted. Was this the biggest police cover-up in British history?

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The Crime Agents is a Global production, available every Monday and Thursday on Global Player, YouTube or wherever you get your shows. Make sure you subscribe so you never miss an episode.

When MPs talk about the death threats they face online, are they making a genuine plea for protection or building the case for something bigger? Andy and Neil take on the question of whether the abuse politicians face is being used to push the digital ID agenda, and where that leaves free speech. Would digital ID actually stop the threats? And what does Neil - a former head of UK Counter-Terrorism Policing - make of the idea that online anonymity is the real problem?

Then to something that decides whether justice gets done at all: the relationship between the police and the Crown Prosecution Service. How closely do the two work during an investigation, when does the CPS actually get involved, and what happens when detectives are convinced they have enough to charge and the CPS disagrees? Are the CPS a friend to the police - or a foe?

Plus: Sir Mark Rowley wants the 43 police forces of England and Wales merged into fewer, larger regional ones. Is that a serious fix, or asking turkeys to vote for Christmas when Chief Constables would be voting themselves out of a job? And last but not least: is 30 too old to become a police officer? And can a career as a detective ever fit around raising a family?

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The Crime Agents is a Global production, available every Monday and Thursday on Global Player, YouTube or wherever you get your shows. Make sure you subscribe so you never miss an episode.

PC David Carrick was one of the most prolific sex offenders in British history and for nearly two decades, he abused women while carrying a warrant card and a gun. Complaints were made about him before he joined the police, and again and again during his career, but he was only stopped after he had assaulted dozens of victims. So how did a man like this pass vetting and then stay on the police payroll for so long?

Neil - who for several years ran the firearms command that both Carrick and Wayne Couzens served in - reveals the cultural problems in a unit described as a 'dark corner' of the Met. He and Andy explain the vetting failures that allowed Carrick into the police in the first place, and the subsequent failings which meant his crimes were never properly investigated until it was far too late.

Andy also tells the story of his exclusive interview with one of Carrick's victims, who described the reality of his abuse: being locked inside the house, cameras installed to monitor her, being denied food, and being told she wasn't allowed to speak on one of the rare occasions he let her meet his fellow officers socially.

They explain how Carrick was finally caught and debate whether policing is doing enough to address the cultural issues laid bare by this case and the murder of Sarah Everard.

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The Crime Agents is a Global production, available every Monday and Thursday on Global Player, YouTube or wherever you get your shows. Make sure you subscribe so you never miss an episode.

Prince Harry and Meghan Markle believe their family isn't safe in the UK. So who decides if that's true? And who should pay if the decision is made to give them police protection? Neil ran the Met's Royal Protection unit for several years and in that role was responsible for Harry & Meghan's security before they left Britain for America. Here, Neil reveals how the system really works and details the nature of the threats the Duke & Duchess are likely to face now they're back in Britain.

Then the fatal crash in Middlesbrough. What does justice look like in this case? And is this evidence that dangerous driving has become commonplace on our roads? Andy and Neil also tackle the pace of the investigation: 17 arrests within a few days. Neil explains whether police really do pull out all the stops when their colleagues are killed in the line of duty.

Plus they look at the Lindsay Clancy trial: do American and British justice systems need to deal with cases potentially involving severe post-partum mental illness more sensitively?

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The Crime Agents is a Global production, available every Monday and Thursday on Global Player, YouTube or wherever you get your shows. Make sure you subscribe so you never miss an episode.

In March 2021, Sarah Everard walked home from a friend's flat in Clapham. She never arrived. Her face went up on lampposts across south London, her name spread across the country, and within a week police had arrested a suspect: a serving Metropolitan Police officer.

Neil reveals how he felt in the moment that he learned the suspect was an officer serving under his command. Andy was living locally and watched a local missing person appeal become a national story. Drawing on conversations with detectives who worked the case, they explain how investigators identified Wayne Couzens, and what it was like for officers to build a murder case against one of their own.

Together they discuss what it says about police culture that a man nicknamed 'the rapist' by his colleagues had been allowed to stay in uniform, and whether this was the biggest crisis the Met's leadership has ever faced. They examine the Clapham Common vigil and whether the force's handling of it was defensible, why Dame Cressida Dick lost her job, and whether women and girls will ever feel like they can trust the police again.

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The Crime Agents is a Global production, available every Monday and Thursday on Global Player, YouTube or wherever you get your shows. Make sure you subscribe so you never miss an episode.

Nigel Farage says Essex Police warned him to stay away from the Clacton by-election count. Essex Police say that never happened. So who's lying? And why are politicians increasingly dragging the police into their political battles? In this week's Q&A, Andy and Neil tackle Farage's claim head-on and ask what it means for public trust when policing becomes a prop in politicians' narratives.

They also discuss the Mushroom Murderer's appeal. Erin Patterson was convicted of poisoning her former in-laws with a death cap mushroom lunch, and from the moment she appeared on camera claiming to be "devastated," most people felt she was guilty. But how often do detectives get an instinctive feeling that someone did it? And can that gut instinct help or hinder an investigation?

Plus: has CCTV revolutionised crime-solving in the same way DNA once did? And do the benefits of Ring doorbells on every street outweigh 'Big Brother' concerns? Andy and Neil also dig into the unsolved death of Zac Brettler, the case at the heart of Patrick Radden Keefe's London Falling, and whether the Met's investigation was as flawed as the reporting suggests.

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The Crime Agents is a Global production, available every Monday and Thursday on Global Player, YouTube or wherever you get your shows. Make sure you subscribe so you never miss an episode.

Three British politicians have been killed in the space of a decade. Jo Cox. David Amess. And now Ann Widdecombe. How has political violence in Britain reached this point? And why are most of our MPs still unprotected?

In this episode, Andy and Neil trace the escalating pattern of attacks on politicians in the UK, explain how police and the Home Office decide who gets protection, and reveal why the number receiving it remains surprisingly low. They explore the growing reliance on private security firms to fill the gaps, and the strain a record nine living former Prime Ministers is placing on already stretched resources.

They're also joined by Philip Grindell, a former Met Detective turned private security expert who helped establish The Parliamentary Liaison and Investigation Team after Jo Cox's murder. Philip explains how the threat environment has changed, how he now protects high-profile individuals from targeted violence, and why he believes some MPs embellish the level of threats they receive when speaking publicly.

Finally, Andy and Neil confront the difficult question: can we realistically protect more of our politicians, and what would it cost our democracy if we tried?

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The Crime Agents is a Global production, available every Monday and Thursday on Global Player, YouTube or wherever you get your shows. Make sure you subscribe so you never miss an episode.

Daniel Kinahan - allegedly one of the world's most powerful gangsters - arrived at a Dublin court this week under near-unprecedented security. Was that level of protection justified, or was it theatre from the Irish state? And how was he finally extradited from Dubai, where he spent a decade hiding in plain sight? Andy and Neil explain why the Kinahan story has moved so fast, and ask whether his upcoming trial could become the biggest Ireland has ever seen.

They also dissect the police failings that allowed Simon Levy, a known sexual predator, to kill two women and attack several others. Does this prove, once and for all, that the police are institutionally misogynistic? Andy and Neil break down what went wrong, and how much damage this case does to the police's efforts to rebuild trust with women and girls.

Plus, the latest on PC Andrew Harper's killers, how police operations are named, and, last but not least: who has dubbed Neil 'Manly' Tucci?!

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The Crime Agents is a Global production, available every Monday and Thursday on Global Player, YouTube or wherever you get your shows. Make sure you subscribe so you never miss an episode.

Imagine a phone network built exclusively for criminals. Encrypted. Untraceable. Designed to destroy evidence at the touch of a button. For years, EncroChat gave drug cartels, hitmen and money launderers the confidence to plan serious crime openly, believing they were untouchable.

They were wrong.

Andy & Neil tell the full story: why EncroChat was created, how it became organised crime's communication platform of choice, and how police ultimately infiltrated it in one of the biggest cross-border operations in law enforcement history. With Tony Saggers - former Head of Drugs Threat & Intelligence at the NCA - they explain what happened when police gained access to the messages of tens of thousands of criminals, leading to lengthy sentences for crime bosses and hundreds of millions in illicit funds seized.

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The Crime Agents is a Global production, available every Monday and Thursday on Global Player, YouTube or wherever you get your shows. Make sure you subscribe so you never miss an episode.