A comedy about a group of children who are spending summer vacation alone in the nature.

Vörös Hajnal (Red Dawn), a co-operative is the venue of skylarking, while the storm destroys the wheat which is to be harvested soon. Árendás, a middle-peasant, voices severe accusations against members of the co-operative: out of negligence, they failed to keep the ditches clean. It is always the soft option they seem to favour, while the necessity of properly taking care of the farmlands is long-forgotten. Members of the co-operative and the village people are deeply divided.

Lugosi works in the locomotive factory, earning little. He does not feel at ease in the world. One reason for his discontent is that his wife - a tractor factory worker - earns more than he does, and another is that she has even had her innovation accepted, while his has not. And because trouble doesn't come alone, poor Lugosi gets involved in a sabotage case.

Prof. Laurent Akush from the Institute of Geophysics is working on a device that can be used to locate coal underground. For successful work he needs a tube XCX13, it is available in the West, but foreign firms sabotage the supply of the device. In his institute there is an enemy engaged in sabotage, but the professor does not believe in enemies. He believes that this is propaganda, science is above ideology, and that "scientists are made of a different dough." Laurent Akush receives an invitation to the international geological congress in Berlin, there he hopes to meet an old American friend, the scientist McLane. He takes with him his assistant Ferenc Ervish and a young Stakhanovite worker, Ishvan Kadosh. The professor does not yet know that in Berlin, Colonel Thompson of American intelligence is preparing a trap for him.

On the shores of Lake Balaton, a group of people rush to their boats as a storm approaches, notice that a boat has capsized on the water and go to the rescue. They rescue a couple, and the young man who rescues them falls in love with the woman.