The wife of a British diplomat in Paris takes a chimpanzee as her lover.

Normandy 1850. A stagecoach drives along a road in the middle of the countryside. Inside, the passengers are all asleep except two men who are talking. Suddenly the coach stops: an axle has just broken. When one of the two men leans out of the window to see what is going on, his gaze lingers on the front a provincial abode, which seems to upset him. He soon starts remembering facts that took place forty years earlier...