December 1924, Karl Denke fails to smite Vincenz Olivier with a pickaxe. He would have been his 31st victim. The film thus reconstructs the mind, motivation, and psyche of its main character in intense dialog between him and the inspector.

The story revolves around Estelle, an incomparably professional long-haul pilot/captain who leads a perfectly structured life alongside her loving and protective husband Guillaume. Everything seems to be going well, although the endless flights and bouts of "jet lag" are beginning to upset the young woman’s biorhythms, especially her sleep. One day, in a corridor in Nice airpor...