Let's Be Friends! Silly Shershilina, or The Missing Dragon

Misha Korobkin and Lida Shershilina have an important task - to invite the famous writer and traveler Mamontov to the school for a meeting with the readers. They will manage it, as they have prepared so well!
But... A single blunder by Lida - and everything went awry: a dragon in one hundredth of its natural size went missing, a puppy turned into a galosh, Misha nearly drowned in the river, and the meeting with the readers was at risk of cancellation.
Lida and Misha desperately try to fix everything, but it seems that the tangle of troubles is only getting bigger...
For children aged 7-10 years.