Dima and his brother Alyoshka knew that their friend was a liar, of which there are few, but this time he surpassed himself. You have to think of something like that - as if you saw with your own eyes how... Carlson, who lives on the roof, flies across the sky! This would make the dreamer laugh, but dad, a police colonel, recently told the kids that some bird unknown to science, very similar to an owl, had appeared in the city. But with a strange plumage... in a cage that steals valuables exclusively from wealthy foreigners. Of course, it sounds incredible, but what if this mysterious flying thief... is Carlson?! "But where did he come from?" - the brothers are perplexed. Miracles, and that’s all! However, they are not used to giving in to riddles. If necessary, they will cope with miracles!..