On the night of November 7, 1974, a blood-soaked Countess stumbled into a London pub screaming that she had escaped being murdered and that her nanny was dead. The man she accused was her husband, a British Earl who, at that moment, vanished into the night and was never seen again.

This episode unpacks the disappearance of Richard John Bingham, the 7th Earl of Lucan, Britain's most enduring modern mystery. We trace how immense privilege, ruinous gambling addiction, and a toxic custody obsession collided in the brutal killing of 29-year-old nanny Sandra Rivett, and why the case still grips the public half a century later.

• Lucan's whiplash childhood, from an American millionaire's mansion to bombed-out post-war London
• His descent into professional gambling, the Clermont set enablers, and debts that spiraled to 50,000 pounds ...