The film, a spin-off of the Mocro Maffia series, is about the character Tatta, played by Robert de Hoog.

In the film, St. Nicolas' Eve threatens to be canceled because a young Piet drops St. Nicholas's clock. In addition, the Saint's horse is behaving very strangely because he has run into Britt Dekker.

Young Fernando will unintentionally bring St. Nicholas' eve in danger when he misses the boat with the golden key in his pocket. With his best friend Pony he trots as fast as he can overland to Holland, but will he still be on time?