Sir George Durand

Attorney Sir George Durand (Michael Gough), resigned to missing his intended traveling companion, Canon Parfitt (Geoffrey Chater), unexpectedly welcomes old friend Sir Campbell Clark (Alan MacNaughtan), a physician who was lecturing in London on an infamous case of multiple personalities and murder. At the last moment, Canon Parfitt makes the train, while a mysterious stranger, Raoul Letardau (John Nettles), makes room for himself in the train compartment and appears to fall asleep. Some smug, spirited comments are made by the three professionals about the "sleeping" man-in-the-street, before said man "wakes up," and calls out the three pillars of society on their assumptions about the famous murder case...of which Raoul is intimately aware.

The story unfolds in The Agatha Christie Hour story "The Fourth Man".