A 1962 Soviet black-and-white drama film directed by Mikhail Romm about nuclear particle physics, Soviet scientists
(physicists) and their relationship. The film won the Crystal Globe Award in 1962.
Two young physicists, an afflicted experimenter Dmitri Gusev (Batalov) and a sceptical physicist-theorist Ilya Kulikov (Smoktunovsky) carry out nuclear researches at a Siberian research institute. Dmitri heads the researches begun by his teacher Sintsov who as a result of experiment had received a deadly dose of radiation. Gusev is irradiated also. Doctors warn that any more radiation will kill him. At that time his friend Ilya and Lyolya who loved Dmitri developed a romantic relationship. The enamoured couple prepares for a wedding and look for a possibility to inform Dmitri about it. When they meet, Dmitri already suspects this and coldly received Lyolya and Ilya. Lyolya is caught up in self-contradictions, and as she tries to establish his true feelings for her she learns about the terrible diagnosis. Realising that she still loves Dmitri, Lyolya cancels her wedding to Kulikov and weds Gusev.