Contemporary Poland. The teenager Zosia Zadora decides to start her adult life. He runs away from home and lives with two friends in the Tri-City. Here she experiences her first love. Sympatia, 20-year-old Kostek turns out to be the boss of a criminal group. Zosia's roommates take part in the procedure. When Kostek is arrested, the girl, after some hesitation, becomes a prostitute. She tries to hide her profession from a young sailor she meets, Stefan Janiak, with whom she has started to feel affection. One day a man learns the truth.