An adventure film about the struggle of the Czechoslovak security authorities against Western agents. In an express train departing from Nuremberg station, a cigarette box with plans and instructions for the destruction of one of the Czechoslovak dams is stuck under the seat. The State Security is informed about the whole operation and tries to catch the foreign agents.
This exemplary "psychological drama" depicts the difficulties with which a new socialist mindset is born. Director Jiří Sequens warns against ill-advised marriages into the families of the defeated bourgeoisie, because the former royalty refuses to accept a man from a different social class. The heroes of this film will find out. The former owner of a pharmacy refuses to accept that his daughter has married a mere technical draughtsman. However, her father's hateful schemes cause the sensitive woman to attempt suicide.
A group of union members, impressed by the First World Festival of Democratic Youth, held in Prague in 1947, decide to found a dance troupe. However, they are looking for someone who can teach them everything they need...
