Neighborhood educators, Alex and Stéphanie take five out-of-school teenagers to cross the Mediterranean and reintegrate them through the values of the sea. But when they arrive at the port, they come across Riton, their skipper, a former BAC cop, who has left everything to flee the suburbs. These young people are his worst nightmare. Forced, they all find themselves embarked on the same boat for a fifteen-day sea trip. One thing is certain, after this Crossing, they will no longer have quite the same vision of the world...