Dogfighting in Britain and Europe runs on secrecy, and a BBC team spends eighteen months undercover to get inside it, embedding with gangs who organize and film the fights themselves. The hidden cameras capture the violence directly, dogs bred and trained for the pit, matches staged in barns and yards, and the money changing hands around them. The investigation follows a second thread alongside the fights: the trade in American pit bull terriers, a breed banned in the UK and much of Europe, bred specifically for combat and smuggled into inner-city neighborhoods by the same criminal networks running the matches. Handlers, breeders, and fight organizers appear on camera, some without knowing they are being recorded, giving a rare look at how the trade is organized across borders and how the animals move from breeder to buyer to pit. The footage is the point here, since dogfighting operates almost entirely out of public view, and the film's access is what makes the practice visible at all.