 Frédéric takes the train to Bordeaux, where he learns that Viviane is.Raoul is also on the train and he leads Frédéric to a seat near another girl, Camille.Camille, a physicist, works at the elite College de France under Professor Kopolski; the two of them are guarding French stocks of heavy water that they want to ship to England before the Germans can get their hands on it.