The film tells about the friendship of two boys – Seryozha and Aghvan. Their fathers were best friends in childhood, but the betrayal of Sergei's father forever crossed out the friendship, and their paths parted. Agvan's father Andrey (Vadim Badmatsyrenov) became a police officer, and Seryozha's father managed to serve time for murder. And now, 10 years later, they met again. An extreme situation puts everything in its place: while children are trying to escape from trouble, adults are figuring things out, as a result of which a 10-year-old mystery is revealed…