In the final episode, Jeremy investigates knife crime after the number of people who lost their lives to knives in 2018 reached the highest level since records began. He goes out on a series of raids with the Metropolitan Police to tackle violent crime, hears from the families of those killed and injured in stabbings, meets youths who refuse to put their knives down and visits prison to see if there's another way to tackle the problem.

Jeremy explores the facial aesthetics industry - because demand for procedures such as anti-wrinkle injections and dermal fillers has boomed, the sector is now thought to be worth a massive £3 billion, yet is almost entirely unregulated. Jeremy meets people who take these procedures to the extreme, hears from a girl who paid the price of a poorly skilled practitioner and goes undercover to put a high street salon to the test - with shocking results.

In the fourth episode, Jeremy probes the private rented sector. More than three million people are thought to be living in properties that are not only unfit for purpose but some are even dangerous. Jeremy goes out with council officers as they visit some of the worst offending properties. He meets tenants living in terrible conditions, confronts a rogue landlord and hears from an organisation fighting for tenants' rights.

This time, Jeremy explores Britain's relationship with alcohol. Every day in the UK more than 20 people die from excessive drinking and that number is rising. In 2016 the government's Low Risk Drinking Guidelines were published - but few people seem to be aware of them and even when they are, many don't follow their advice. Jeremy goes out with West Midlands Ambulance Service to see the impact alcohol has on emergency services, speaks to those addicted to drinking, and consults an industry expert on the true scale of the problem.

In the second episode, Jeremy investigates a massive rise in moped muggings - 2017 saw a huge spike in this type of crime and the Metropolitan Police are fighting back with their controversial, tactical contact operations. Jeremy goes out on a patrol to see why they say this approach is necessary, meets the victims of attacks to understand the impact on their lives - and gets caught in the middle when he tries to confront youths involved in it.

Jeremy investigates a sinister new phenomenon apparently fuelled by the housing crisis. It's thought that 250,000 women have been affected by arrangements where landlords offer free accommodation in return for sex. Jeremy meets a young woman who says she had no choice but to agree to one of these arrangements, tracks down and confronts men who are doing it, in a bid to understand why it is happening and what can be done to stop it.