The reader is introduced to "the idiots" as the narrator is driven near Ploumar in Brittany and they are pointed out on the road by the driver.
The earlier story of the family follows. Jean-Pierre Bacadou, returning from military service, finds his elderly father's farm is in a poor state, and resolves to make improvements. He marries Susan; the celebration of the event at the farm is picturesquely described.
Twins are born; Jean-Pierre notices something is wrong. His wife says, dully, "When they sleep they are like other people's children." A third child is born. "That child, like the other two, never smiled, never stretched its hand to her, never spoke..."