On November 7th, 1974, nanny Sandra Rivett was beaten to death in the basement of a London townhouse, and Lord Lucan, the aristocrat gambler accused of killing her, vanished the same night, never to be found. This film centers on Lady Lucan breaking decades of silence to give her account of the marriage, the murder, and the man the tabloids turned into Britain's most notorious fugitive. Interviews and archival footage retrace the couple's crumbling finances, Lucan's obsession with regaining custody of his children, and the police investigation that concluded he was Rivett's killer despite no body ever surfacing. The documentary weighs the leading theories about what happened after he fled, from suicide off a Channel ferry to a quiet new life abroad funded by wealthy friends, against the physical evidence left behind at the scene. Lady Lucan's testimony, delivered on camera for one of the only times publicly, gives the familiar tabloid story a firsthand source it has largely lacked for forty years.