Paul Dedalus is at a crossroads in his life. He has to make several decisions; should he complete his doctorate, does he want to become a full professor, does he really love his long-standing girlfriend, or should he re-start with one of his other lovers?

In November 1918, a few days before the Armistice, when Lieutenant Pradelle orders a senseless attack, he causes a useless disaster; but his outrageous act also binds the lives of two soldiers who have nothing more in common than the battlefield: Édouard saves Albert, although at a high cost. They become companions in misfortune who will attempt to survive in a changing world. Pradelle, in his own way, does the same.

While on a trip to Paris with his fiancée's family, a nostalgic screenwriter finds himself mysteriously going back to the 1920s every day at midnight.