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For ten years, police major Vasilisa Zhuravleva has been trying to unravel the mystery of her sister Nika's disappearance. Quite a few girls, "night butterflies" from the highway, similar in type to Nika, have disappeared in Zalesye. But the authorities refuse to look for them and unite them into a series. But when hunters discover the body of another young blonde in the forest, Vasilisa gets a chance to open a case and begin an investigation.

Vasilisa's friend, Tatyana Tarasova, was killed. The main suspect is Nikolai, Tatyana's husband. In a drunken stupor, he often beat his wife. Vasya repeatedly suggested that her friend write a statement against him, but she refused. In addition, it turns out that Vasilisa's son, Ilya, skipped school and did not spend the night at home. He is clearly hiding something.