A comedy about exchange of 12 apartments , which, its organizer, lawyer Radosta, rightly called Action Ball Lightning. To prepare, organize and execute the exchange of twelve apartments is a work worthy champions. Radosta, who was excellently played by Rudolf Hrušínský, solved all sudden difficulties and complications on the fly and with grace. To be sure that the on the D-day everything goes well he prepares a little rehearsal, which reveals many minor issues caused for example by wedding ordered to inappropriate term or hesitation of some participants. Last but not least a night exercise announced by drunk psychologist Knotků, creates a lot of confusion that nearly sabotaged the whole operation.
It is the summer of 1945. A party of young people are enjoying the beginning of a new life to the full. For them this is the year one. One of them, law student Pavel, is more attracted to film than to law. With his eight-millimeter camera, he films everything that catches his attention. One day he captures an interesting face on film, a girl with an air of mystery. Pavel visits the girl, whose name is Helena, and meets hers and her elder energetic sister Olga. From Olga, he learns that the girls have spent the years of German occupation in a concentration camp and cannot forget the horrors they have lived through.
