Just before December 5, Sinterklaas mysteriously disappears from the castle. The Club's Pieten don't understand what's going on and become worried. When Sinterklaas reappears a little later, he says unkind things and behaves strangely. What happened to Sinterklaas? And what was that Toy Doctor doing at the castle? It is Mees and his neighbor Katja who discover what is going on with Sinterklaas and what the secret of the peculiar Toy Doctor is. Pakjesavond is in danger, and they must warn the Pieten of the Club van Sinterklaas as soon as possible! Will the Club Pieten and Mees & Katja manage to unmask the Toy Doctor in time? Will they succeed in making sure that Pakjesavond can still go ahead this year?

Throughout the country there is only one child who never puts her shoe: Floor. If she wants something, she just asks her rich father, the baron. Until Floor wants a pool full of chocolate items one day.

Which child would not want to discover how to become a helper of St. Nicholas? But for that you should be allowed to enter the castle in Spain! This year St. Nicholas gives one child the chance to make this dream come true. A Golden Pepernoot is hidden somewhere in the Netherlands. The child who finds it can go to the helpers school in Spain. But if two Golden Pepernoten are found, the helpers have to take Coole Piet fan Lucas and a mysterious man to the castle. Who will pass the exam to become a helper and can join st. Nicholas on the boat to the Netherlands?

Sinterklaas and the Clubpieten have a busy year ahead: never before have so many shoes been put out. But the villain Kornee wants to ruin the Sinterklaas celebrations. Due to a mistake, he never received a gift from Sinterklaas when he was a child. To get his revenge, he has created Moepies, a new kind of cuddly toy. Kornee orders the funny Moepies to steal the presents from the children's shoes. When one morning not only the presents but also all the shoes are gone, the Petes are blamed. Sinterklaas doesn't understand what's going on. Will everything be okay in time?