A brilliant business lawyer finds that an old Rumanian homeless woman looks a lot like his grandmother. One night, he makes a cardboard sigh for her "I could be your grandmother". Passers by become much more generous. Other homeless people request signs from him. Their demands are soon too much for him.

Nadia raised, alone, her son Noé in Paris suburbs. She is proud when he is accepted in second in the prestigious high school Henri IV. To promote her studies, she moved to Paris and went into debt to offer what others have. She discovers the pleasure of buying, unknowingly developing an addiction to consumption. Even as her son manages to adapt to his new high school, she can not stop.

Frank Martin puts the driving gloves on to deliver Valentina, the kidnapped daughter of a Ukrainian government official, from Marseilles to Odessa on the Black Sea. En route, he has to contend with thugs who want to intercept Valentina's safe delivery and not let his personal feelings get in the way of his dangerous objective.

A few days before the baccalaureate, a high school student decides to settle accounts with the most cowardly teacher in the school.