A BBC Three team goes undercover to trace how drugs actually move through Britain's summer festival scene, from the street-level dealers working the campsites to the suppliers further up the chain. Across three episodes, hidden cameras and undercover reporters follow the deals as they happen, catching the casual way transactions are negotiated in fields packed with tents and sound systems. The series treats the festival drug trade as a functioning economy rather than a moral panic, showing the logistics of getting product past security, the pricing, and the risk calculations dealers make about getting caught. Interviews with people inside the trade sit alongside the undercover footage, giving a rare firsthand account of why the supply keeps flowing even as festivals tighten searches and policing. It is less concerned with warning viewers off drugs than with mapping, in concrete detail, how an illegal market operates in plain sight at events built around music and crowds.