How Romka and her sister and their friend Venochka felt that the unpleasant guy who came to them following an advertisement to pick up the dog the boys had found was an impostor. And the real owner of the wonderful dog lies in the hospital, struck by terrible news: a priceless copy of his collection of antique porcelain has been stolen. “But he simply won’t survive the loss of his best friend!” - the guys think with horror and decide to return the Great Dane to its owner at any cost, and at the same time find the criminal. Soon the young detectives are on the trail, it seems that the kidnapper is about to get into trouble, when suddenly...