Darren McGarvey explores Scotland's dangerous love affair with alcohol.

At the liver unit in Dumfries and Galloway Royal Infirmary, Darren shadows Dr Mathis Heydtmann to see first hand how Scotland's obsession with alcohol is causing us deadly harm.

In Dundee, he meets psychologist Suzanne Zeedyk to confront his own battles with alcohol and try to understand his problematic relationship with it. He also talks to historian Thora Hands to discover whether Scotland has always been a nation of hard drinkers.

Darren then volunteers himself for an experiment to determine whether he has an unconscious bias towards alcohol-related images, before meeting Dr Richard Purves to learn some of the advertising tricks that encourage us to buy alcohol.

In Edinburgh, he asks Michael, whose excessive drinking led to a liver transplant, why people from the LGBTQ+ community statistically drink more than the rest of the population. And he visits a liver clinic in Stirling to find out whether his own past heavy drinking has done permanent damage to his body.

Darren meets a grieving father who believes his son's death from an alcohol-related seizure could have been avoided if the appropriate support services had been in place, and, in Edinburgh, he visits the only NHS residential rehab facility in Scotland.

How can you be addicted to a behaviour? What happens when you remove the chemical hooks of drugs and alcohol? Darren attempts to answer these questions by going back to where it all started for him: food. He meets Annemarie, who despite beating addictions to drugs and alcohol still struggles with food, and learns that for many, food is simply another way of coping with trauma. But in a world where fast food is big business, it can be hard to avoid. Darren meets food scientist Dr David Gally to find out exactly why the drive-thru and the chocolate aisle are so hard to resist.

In Livingston, Darren meets Aidan who is in therapy for porn addiction, and has a sit down with psychosexual therapist Pauline Brown to try to understand why sex addictions are on the increase.

Darren learns that our obsession with screens has led not only to a rise in pornography use but in our gambling habits. He meets social scientist Heather Wardle to chart how ‘having a flutter' has changed over the last hundred years, and joins a march across Scotland with The Big Step as they try to get gambling adverts kicked out of football.

With gambling mechanisms now a normal part of many video games, Darren meets Jonny who spent thousands of pounds on ‘loot boxes' as a teenager. But it's not all bad news as Darren takes to his games console to meet Joe Donnelly, a gamer who found community and therapy amongst the hills of Grand Theft Auto, and in the finale of the series, Darren learns that the opposite of addiction is connection as he joins Govan charity GalGael for their community meal.