A trucker's deathbed tape plays out. It's urgent, desperate. "All you have to do... is dig it up." And so begins a deep-dive into one of the worst environment crimes in UK history: the secret dumping of a million tonnes of waste near a city. But when investigative journalists Dan Ashby and Lucy Taylor uncover missing documents, fears of toxicity and allegations of organised crime, they realise they've stumbled into something much bigger. As they pick at the threads of one crime, they begin to see others. Could Britain be the home of a new mafia, getting rich on our waste? In this thrilling series, a husband-and-wife duo dive into a criminal underworld, all the time following clues left in a deathbed tape. They're driven by one question: what did the man in the tape know?