When Joris (Martijn Nellestijn) and Boris (Richard de Ruijter) of a notary is an important but mysterious heirloom in hands, the duo goes in search of the precious possessions of their ancestors. While Inspector Jankers (Frederick the Great) thinks that the duo wants something naughty tricks, he follows them to the island of Cyprus. If George and Boris friends with Max, Michael and Anna end up in the hotel Aunt (Inge Ipenburg) and her sidekick Grudo (Bartho Braat). These two, however suspiciously interested in the quest of the group of friends ...

Danny is a student that barely gets any attention at home because his mother is mentally ill. At school however, he is very popular and known as a big bully. His main victim is Suus, a lesbian classmate who faces many problems due to her sexual orientation.

Sinterklaas receives a letter from Eefje, who has a special wish. This wish is so difficult that it seems impossible. Meanwhile, Huismeesterpiet falls ill for unknown reasons and his duties are taken over by Rommelpiet. The other Pieten disagree with this because since she took charge, the castle has been a mess. Sinterklaas receives a visit from Willem de Schipper, who comes to apply for a job. But Willem turns out to be the missing piece of the puzzle for Eefje's wish.

The festive arrival of Sinterklaas is overshadowed by a huge problem: due to a large shortage of staff, the tradition threatens to disappear once and for all. Sinterklaas is desperate: where can he find new, good staff on such short notice? The youngest member of staff suggests they organize an audition in which everybody can show off their skills in order to become a member of staff; a so-called 'Piet'. Sem writes a letter to register for this audition immediately. If he can become a tough, strong 'Piet', his bullies will never harass him again. But what nobody knows is that Huibert Jan and his "Mammie" are trying to sabotage the audition with an evil scheme. Will Sem, Patty Pepernoot and 'Piet' Bennie successfully save the audition or is this the end of the festive and beloved Sinterklaas tradition?