Gallery owner Mr. Prentice is desperate. He urgently needs help and asks the three friends to investigate the eerie howling in his apartment. Who wants to intimidate the elderly gentleman? While the investigation is underway, the case takes a turn: a valuable piece of art, the Carpathian Dog, disappears without a trace. Who has stolen it? Every neighbor is acting very suspiciously. Many exciting challenges await Justus, Peter, and Bob! The book is based on the film in the Heroes of Books series and features many cool photos from the movie.