We are 40 years into the future, and London is a city in decay. John Watson has returned from medical service in the war in Afghanistan and lives by himself in a run-down part of ​town. On his way home from work, he stumbles upon a beaten man in the street – unconscious and completely naked. His chances of survival are minimal. The same evening, a passenger plane crashes in Richmond Park. There are several hundred victims, and Watson and the mysterious man are left to their own devices.

Spring, 1918. The Great War is at a crucial stage, the Germans are making one last push into France, and the Allies are struggling to hold them back. Battle lines are shifting, and men, and their machines, are being sent up and down the front to shore up defenses. Major Heathcliff Lennox, and his batman Greggs, are told to report to their new HQ. They set off on a sunlit day to fly the distance, but the enemy is never far away, and disaster strikes. They're sent crashing to the ground behind enemy lines, where life, death, and love await.

It had been a typical New Year's Eve party. But as midnight approaches, Mr. Satterthwaite - a keen observer of human nature - senses that the real drama of the evening is yet to unfold. And so it proves when a mysterious stranger knocks on the door. Who is this Mr. Quin? Mr. Satterthwaite's new friend is an enigma. He seems to appear and disappear almost like a trick of the light. In fact, the only consistent thing about him is that his presence is always an omen - sometimes good, but sometimes deadly....

Little progress had been made by the Thames Valley Police since the discovery of a corpse in a North Oxford flat. The victim had been killed by a single stab wound to the stomach. The police had no weapon, no suspect, no motive, but within days of taking over the investigation, Chief Inspector Morse and Detective Sergeant Lewis uncover startling new information about the life and death of the victim, Dr. Felix McClure, late of Wolsey College, Oxford.

Three critically acclaimed recordings are joined together in this dazzling Agatha Christie Triple Bill, read by award-winning narrators Alison Larkin and James Warwick, star of the Partners in Crime TV series on Masterpiece Theater.