A group of students goes on a picnic into the mountains for the New Year. They stop at a country house. Everything is going fine, but suddenly they find one of them (the most popular girl) dead, with a knife in her chest… A blizzard rages outside; they are cut off from the city, and they understand that the killer could only be one of them—but who? The work is written in an original manner: the story is divided into chapters narrated by each of the characters, and the reader’s suspicions gradually shift from one hero to another.