

A family fights to survive as the streets of Paris fill with a deadly gas.

Martin is a philosophy teacher in the midst of a mid-life crisis. Lacking direction or purpose in his life, he initiates an affair with Cécilia, a young artist's model who might have killed her former lover.

Paul and Charlotte are in love. Charlotte discovers she has a grave malady and Paul supports her. But Paul is also attracted to Ninon, another girl. Charlotte accepts Paul to have an affair with her, and the three start a difficul...