Anton and Alina, Mark and Sonya, Alex and Katya are yesterday's schoolchildren who are just starting to live as adults, fall in love, dream, make plans for the future, until a terrible tragedy happens at a party. Now they, their parents and the investigator need to restore the picture of what happened. The further the interrogation goes, the more problems and secrets are revealed. Teenagers are confused and scared, and parents are wondering: did they know their children well at all?