Serge Morin, metro driver, has to deal with the fear that obsesses him, to become for a second the instrument of death. That night, on the other side of town, a young woman has decided to commit suicide. She has chosen the metro to put a end to her life. Her decision seems irrevocable. Is it chance that brings these two people together or aren't they bound to meet since they share the same obsession, to put an end to their past life?