Parents of thirteen years old Lena just got divorced. Lena wants to prove that they live nicely even with her mother alone and that she is independent. The girl goes to work at post office utilizing there her resourcefulness and charm. At work everyone talks about a serial killer who keeps the entire region in terror. One night a stranger defends Lena from some hooligans and as Lena thinks, he continues assisting her incognito. The girl is ready to believe and convince others that her protector is that horrible maniac. At first, these relationships with her odd admirer seem as a gamble for Lena, but then she gets convinced that this game became deadly dangerous.