Conduit and mopper. Kassil L.

Brothers Lelya and Oska invented a fantastic country with a mop. Adventures and mysterious stories, unexpected discoveries and dangerous situations - all this can be found in a mop. There you can become anyone - a hunter for wild animals, a pirate, a researcher... Having entered a gymnasium, children face a harsh reality, where they are punished for the slightest violation, and the name of the guilty is recorded in the terrible book of the director - condet. Gradually, Lelya and Oska grow up, and they have to solve problems in the real world: to resist school hooligans, to help adults.