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A scientist meets a nice girl and they start dating. He decides the only way to find out for sure if she’s the one is to take a long trip with her, but things don’t go quite as he’d hoped.
A new patient enters the psychiatric sanatorium Sluneční dvůr. It is a high school Czech professor Robert Kilian, suffering from depressive neurasthenia, which manifests itself in a morbid indecision. His biggest problem at the moment is that he doesn't know if he should marry his girlfriend. He soon gets to know the other patients, the treatment regimen and the medical staff...
Many of the young workers at an aircraft factory near Prague are members of an aviation club. On the one hand, there is the responsible Franta, who is highly regarded by his colleagues due to his understanding nature. Opposite him is the talented aircraft designer Ruda, who is also an excellent pilot, but also hotheaded, undisciplined and condescending towards his colleagues. He starts flirting with the glass grinder Lída, although he knows that she is Franta's girl friend. A conflict is not long in coming. When Franta's glider crashes due to a suspected mistake by Ruda, Ruda is banned for a certain period of time. This is fatal, because both young men were actually supposed to represent Czechoslovakia at the upcoming international gliding championships in Poland.
