Lucie Rýdlová is found dead at a destroyed car after a night accident. The seat position shows that she cannot have been driving, and the dissection proves that she had died about four hours after the accident. It is for sure that a timely medical assistance could have saved her life. A pretty young tennis player Lucie lived at her grandmother, because her parents had been working abroad. Criminalists found out that the girl was going out with the interpreter Valenta (Eduard Cupák), who was twenty years older than her, divorced and a bit egoistic man.
An only son, Jirí Valenta (Jaromír Hanzlík), has been drafted to the army. At the barracks he acquires the nickname Seamstress because he sews rugs in his spare time. One day, his friend introduces him to Julka Vávrová (Jorga Kotrbová), a girl he is desperate to get rid of. The naive Jirí falls in love with the girl and accepts her invitation to spend Easter together in the country. There he learns that the girl is the single mother of the young boy Martínek, whose father is the married tractor driver.
