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 is back in the country, so it's high time for the annual "Great Gingerbread Baking Competition." Bakers from all over the country are vying for the title: Master Baker of the Year. Marco Marsepein is also determined to win, as he succeeds every year. His dearest grandmother's secret recipe has never let him down. But... this year, Bartus Bakker and his father are also vying for that coveted first place. The evil baking duo cunningly steals Marco's secret recipe and ruins his gingerbread dough. When Bartus Bakker wins the baking competition, Marco is utterly devastated. He decides to leave Sinterklaas's castle and return to his native Italy once and for all. But what would a great Sinterklaas celebration be without Marco Marsepein and his gingerbread?

Sinterklaas plans to celebrate his birthday lavishly. This year, he's coming to the Netherlands for the hundredth time, and that's reason for a big party. He wants every child in the Netherlands to receive an extra present this year. At the same time, the Pieten (Black Petes) plan to surprise Sinterklaas with a big party, culminating in a special performance by one of the Netherlands' most famous artists. Robbie Reuzel, whose birthday is also on December 5th, hears about Sinterklaas's grand plans and becomes furious. After all, it's not the first time his birthday has been ruined by Pakjesavond (Santa's Eve). He devises a plan to outwit Sinterklaas, taking advantage of his witty neighbor, among other things. Will Robbie Reuzel succeed in thwarting Pakjesavond, or will the Pieten smell a rat and save the Sinterklaas celebration?