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The Earth is facing great problems in the nearest future it is in the lack of sun light. Physicist Olmin is leading the project to build a special tunnel —made of elementary fractions— from the sun to the earth, in order to the earth could get much more sun energy and light. At the same time a strange flower is brought to the Earth from a dead planet.

The father, the captain of the merchant fleet, had three sons: Cyril - an artist, Yuri - a sailor, Gerka - a musician. It would seem that nothing can interfere with their friendship. But the older and middle brothers are in love with one girl - Svetlana. Rivalry makes them enemies. Yuri can not forgive betrayal, and between the brothers there is a big quarrel. Suddenly, misfortune falls on the family - during a fire on the ship, their father dies. Grief brings the brothers closer together.