Five members of the Čtrnáctý family move to a small house in the village of Heřmanice. Ferdinand Čtrnáctý is a pedagogue working in a music school, his wife is an elementary school teacher, their eighteen-year old daughter Bíba studies at the technical college of transportation and the son Ludvík is in the fifth grade of elementary school, while the grandfather Matěj controls the family's practical matters. Ludvík is a fanatical admirer of physics, and he thus constantly indulges himself in various experiments which, however, end up rather ingloriously. Ludvík records all details of his experiments - including all the formulas and charts - in his yellow notepad. The physics teacher meanwhile has no idea that an extremely gifted physicist is studying at the school, and he thus only bothers himself with children who are rather uninterested in the field. Ludvík prepares a significant experiment to verify "sound diffusion in water", which should result in a large explosion at five on a Friday afternoon.
The event should be accompanied by a performance of a children's ensemble called Hlaholík, to be held in an open-air theatre under the supervision of the father Čtrnáctý. The physics teacher somehow succeeds in seizing Ludvík's yellow notepad. He thus sets off to the local pond, accompanied by the PT teacher Hrabě, and is finally introduced to Ludvík and his sister Bíba.
They carry out the experiment on a smaller scale together - just to exclude any danger. And while Bíba enjoys her beautiful moments with the young Hrabě, the physics teacher and Ludvík are consumed by a discussion about the laws of physics.
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