Not a Day Without a Mystery

The coolest adventure happened to inseparable friends Seryozha, Nastya, and Deniska. Sneaking onto a decommissioned submarine docked at the shipyard, the kids suddenly became... participants in tests classified as «Top Secret». And then — seas and oceans, an instantaneous break in pulse mode from a NATO submarine, the discovery of an ancient underwater city-civilization, a meeting with Aug, a habitable uninhabited island, drug dealers, the capture of Seryozha... and much more!..
Read about the amazing adventures of Seryozha, Nastya, and Deniska also in the stories: «Treasures of the Green River», «To the Right of the Star», and «The Magic of the White Stone».