On New Year’s Eve at Anton Snegirev’s dacha, four married couples—old friends—gathered. Everyone was having fun until one of the women was found dead with a stab wound in her arm. The whole company is in shock: how could something like this happen? But calling the police is dangerous because of Anton’s status, so the friends decide to investigate the incident themselves. Suspicion falls on several guests, but suddenly another terrible incident occurs. Now it becomes clear that the killer could be any of the guests…