Alone in the mountains of Switzerland, Anne discovers that her isolated chalet is on surveillance and has been bugged. Caught up by her former life as an intelligence secret agent and an affair with her handler, Anne can only count on herself to get out alive.
Patrick is a tenacious lawyer specializing in environmental law. France is a schoolteacher who becomes an activist after her husband develops cancer from exposure to a pesticide. Mathias is an ambitious lobbyist working for an international chemical corporation. The paths of these characters collide as the lives of thousands are affected by a tragic act that sparks a powerful movement while the corporation fights to prevent the truth from being revealed.
The French government is asking Gustave Eiffel to design something spectacular for the 1889 Paris World Fair, but he simply wants to design the subway—until he crosses paths with a mysterious woman from his past.