For the first time ever, a senior detective and undercover agent has broken rank to reveal the stark reality of life in the police force today. Duncan MacLaughlin was one of New Scotland Yard's elite. In a career spanning more than two decades he served in both the Central Drugs Squad and the Regional Crime Squad - Britain's equivalent of the FBI. Trained in SAS covert techniques, his expertise lay in money laundering and undercover surveillance and he walked a dangerous tightrope that could have got him killed at any moment. Infamous cases in which he was involved include the investigation of Kenneth Noye, the pursuit of kidnap victim Stephanie Slater and the slaying of PC Keith Blakelock. He also penetrated international drugs cartels and nailed the ruthless barons who controlled them. Filled with black humour, gritty slang and investigative detail that only an ex-copper could reveal, MacLaughlin's story is a riveting insight into the world of serious crime that is both thrilling and frightening. With shocking behind-the-scenes stories that you'll never read in the papers or see on Crimewatch, The Filth is the true story about working on the dark side of the streets.