Autumn has finally arrived in Listvyanka, and Klinkus is very happy about it! The boy will celebrate his birthday with friends for the first time: now the guys will be able to have a lot of fun! But at the very height of the holiday, the clearing where Klinkus’s house stands was filled with smoke. Who could light a fire in the Big Forest when there are a lot of dry leaves around? Because of this, the city in the trees is in danger, because it can catch fire at any moment! What is happening and how to save Listvyanka?