Based on the stories of G.Seversky. Events taking place in the besieged Sevastopol during the WWII.
The inveterate fisherman Karp Trofimovich has his birthday during competition of fishermen so his nephew clings a huge pike to the uncle's hook .
Pupils go on a trip to St. Petersburg. The next morning they wake up in the middle of an unknown terrain. The pupils try to find a way out.
