Engineer Rataj has been entrusted with running the nuclear program at his company. His job entails two vital tasks: setting up an expert team and resolving problems with the production of a steam generator. He fulfills the first task swiftly, and puts his son Ondra, graduate of the nuclear physics faculty, on the team. The other task is more complex. In order to produce the steam generator, a modern electro-steelworks needs to be built first, and that is not an easy feat.