Julian Fellowes is our guide, acting as a historical detective and uncovering the dark goings-on behind these five real life, unsolved, mysterious murders.
The Case of Charles Bravo - 1876: Charles Bravo dies in agony from antimony poisoning four months after his marriage to a beautiful, rich and scandalous wife. Suspicion falls equally on his wife, her companion, her lover and a disgruntled groom.
The Case of Rose Harsent - 1902: A pretty, young servant girl, Rose Harsent, several months pregnant and unmarried is stabbed to death in the village of Peasenhall. The murder tears apart the hardworking Suffolk community.
The Case of George Harry Storrs - 1909: A wealthy industrialist George Harry Storrs meets his untimely death at home. His servants and his wife make a valiant effort to save him, tolling the recently installed alarm bell.
The Case of the Croydon Poisonings - 1929: After the First World War when the third person in a respectable middle-class family in Croydon dies after a short illness, suspicions are raised. Two exhumations later and the police are looking for a serial killer.
The Case of the Earl of Erroll - 1941: The Earl of Erroll meets his death with a bullet through the head just outside Nairobi. Rumours abound about his affair with Diana Delves Broughton. Her husband Jock ends up in the dock with his neck on the line.