October 1942, during the occupation. Philippe Gerbier, a civil engineer, is one of the French Resistance’s chiefs. Given away by a traitor, he is imprisoned in a camp. He manages to escape, and joins his network at Marseilles, where he makes the traitor be executed... This non-spectacular movie shows us rigorously and austerely the everyday of the French Resistants: their solitude, their fears, their relationships, the arrests, the forwarding of orders and their carrying out...