Lucien, 14, can’t understand why his father, a serious and respected teacher, makes a fool of himself by dressing up as a clown and giving a show. André, Lucien’s father’s best friend, feels for the teenager and decides to reveal something from their mutual past that will explain the reason for Lucien’s father’s strange behavior.

Four prison inmates have been hatching a plan to literally dig out of jail when another prisoner, Claude Gaspard, is moved into their cell. They take a risk and share their plan with the newcomer. Over the course of three days, the prisoners and friends break through the concrete floor using a bed post and begin to make their way through the sewer system — yet their escape is anything but assured.

Roberto goes to Marseilles to give a hand to his friend Xavier, wrongly imprisoned following a frame-up organized by his associate Villanova. Roberto sets out to seduce Villanova’s mistress, but when Villanova is killed, Roberto ends up leader of the band…