Dina works with children and enjoys a quiet family life. She has a daughter named Olya, and another woman is waiting for an official proposal of marriage from her common-law spouse Sergey. Everything changes in an instant when Dina's friend Yana disappears without a trace. But the misfortunes don't end there: another friend of the heroine, Anna, dies under mysterious circumstances. Dina's husband blames her for it all. In order to understand the situation, she takes on her own investigation. She is aided in this by her longtime comrades Evgeny and Alexey, who work in law enforcement. As she becomes involved in the case, the heroine doesn't even suspect that she is putting her own life at risk.