Shortly before 5 December St. Nicholas disappears mysteriously from the castle. The helpers of the Club do not understand and are worried. If St. Nicholas naturally reappear moments later, he says unkind things, and he behaves strangely. What happened to him? And what did that Toys Doctor at the castle? Mees and his neighbor Katja discover what is wrong with St. Nicholas and what is the secret of the strange Toys Doctor. St. Nicholas' eve is at risk and they need as quickly as possible warn the helpers of The Club! Will the Club and Mees & Katja succeed in time to unmask the Toy Doctor? Can St. Nicholas' eve this year still going through?