The plot explores the devastation of civilization and issues of brutality, hostility and isolation. Pierre Jolivet stars as the main character (identified only as "The Man" in the end credits) who is menaced by "The Brute" (played by Jean Reno) on his journey through a world filled by people rendered nearly mute by some unknown incident.

Fred, a raffish safe blower, takes refuge in the Paris Metro after being chased by the henchmen of a shady businessman from whom he has just stolen some documents. While hiding out in the back rooms and conduits of the Metro, Fred encounters a subterranean society of eccentric characters and petty criminals.