In the latest musical family film De Grote Sinterklaas film: Gespuis in the Toy Vault, Hugo Hogepief is given the important task of looking after Sinterklaas' key ring. This ring gives access to the safe in which all the presents for Christmas Eve are stored. But when he accidentally falls, Hugo no longer knows who or where he is.

Sinterklaas and the Pieten have a big problem. The castle of Sinterklaas is about to collapse. It must be demolished. That is why Sinterklaas and the Pieten are forced to stay at a campsite. Even Hugo Hogepief is at a loss, because no castle means no presents and gingerbread cookies for the children. Even though Kim Kado, Marco Marsepein and Willem Wortel try their utmost, there is a huge chance that the Sinterklaas party will not happen. But is the castle of Sinterklaas really about to collapse or is it a cunning plan by Stan & Olivier? Kikkie and Paco don't trust everything and start an investigation. Will they manage to save the Sinterklaas party?

When Mammie and Stan are freed from jail the two once again set their sights on eliminating the Black Petes and Saint Nicholas.