Everyone knows that mermaids and mermaids only exist in fairy tales! Venya Pukhov and his classmate Varya also thought so. Until we got to the Mermaid Pool. It was here that they met a real merman and a mermaid, who were busy... with mysterious searches in an abandoned mill! You can’t even read about this on the Internet! The guys began an investigation. But what would they do without their faithful mini-pig friend Piglet? After all, in order to reveal the secret of the old mill, he taught Venya and Varya... to walk on water!