Schoolchildren Yanka and Johan could not even imagine that one day they would make friends with a living dragon! And also with his impossibly harmful neighbor from below, Frau Tosillo. The brother and sister fell in love with Kurmo and Frau Tosillo very much and every day after school they happily ran to play with the little dragon. But it suddenly turned out that Kurmo was someone else’s dragon and ended up in Frau Tosillo’s suitcase by mistake. And the bad news is that it needs to be returned immediately! So what should we do now? After all, there is no way to hide a huge dragon in a small apartment... At the last second, Johan manages to take the situation into his own hands and transfer everyone into the computer game “Mysterious Silence.” It seems that the danger has passed. But the fantastic world of the game is not at all similar to ours, it has its own laws and its own villains...