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Energetic Dr. Alice Váňová becomes the pit doctor at Mír Mine and spearheads a silicosis prevention study requiring miners to drink milk regularly. The miners, led by a tight-knit group, stubbornly refuse public participation. Determined union chair Janeček resorts to psychological tactics and pressure campaigns to force their compliance, turning a health initiative into a tense battle of wills.
The hero of the story is the writer Vladimír Tůma, who is invited to spend a month studying in a neighbouring country. There, the foreign office assigns him a guide, Irena Stepowska. The two young people are attracted to each other, but there is a catch - Vladimír is married, Irena is married. But as they say, opportunity makes the thief, so it's no wonder that Tůma has his work cut out for him, and Irena, too, sometimes recovers only at the last minute. And she doesn't even know that her husband is coming to visit her...
The water fairy Rusalka falls in love with an earthly prince. In vain, Father Aquarius warns her. Her sincere feelings are met with human treachery...
