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.
Jérôme and Cédric play basketball in the same team at school and are best friends. Jérôme also gives Cédric some private math lessons. During one of those sessions, Cédric's action will be interpreted by both young men in a different way.
