Princess Margaret, younger sister of Queen Elizabeth II, and John Bindon, a London criminal with a long record of violence, make an unlikely pair, and this film traces how they came together in the late 1960s. Bindon moved through London's underworld and its film sets in equal measure, trading on a reputation that made him both feared and, in some circles, fashionable, while Margaret's position placed her under constant public scrutiny. The film follows how the two crossed paths and what drew a royal into contact with a man the police knew well, using interviews and archival material to reconstruct a relationship that became tabloid material once it surfaced. It sits at the edge of two worlds that rarely touch, the palace and the criminal underworld, and treats the affair as a case study in how fame, class, and notoriety can collapse the distance between them. The story stays grounded in what actually happened between two real people rather than the myth that grew up around them afterward.