Frederik has invited the entire class to his yearly Christmas party. He and Josefine have been practicing for the dance competition. As they are about to take the floor, Josefine tells him something that change the entire evening.
Frederiks life collapse when Josefine tells him that she has to change school. It causes a lot of fuzz during the dance competition, when Frederik and Josefine is no longer a couple, and then something happens, which stops the entire class.
Frederik invites Josefine home, so they can prepare a presentation for the class. This is but a cover, since Frederik wants to try convince Josefine to stay. It turns out to be more difficult than he thought.
The class has to do presentations on how to make the world a better place. Frederik shows up unprepared, and has to improvise. He doesn't get the feedback he expected.
Martine and Frederik are in the forest to pick a Christmas tree. Frederik has planned to use the trip to make Martine agree on the mutual Christmas, but his plan doesn't work as intended, and strange things starts to happen.
Finally it's December 1st and it's time for the package game. Caroline is first, but which package is the best? It's not made easier when a strange big package appears.
Caroline and Frederik are in deep trouble after unwrapping all the gifts. In the last minute Bertram saves them. He has important news on The Evil Santa. T.E.S. has been at it again, and this time he is after one particular class member.
The Black Squad forces Frederik to apologize to Martine, after he accused her for being T.E.S. A series of events, makes them join forces, in figuring out who T.E.S. Frederik immediately tells Caroline about their theory.
Frederik has set a trap in order to try to capture T.E.S. An argument med Josefine, forces him to let Caroline be in charge of the task. Will his plan succeed? Or is T.E.S. too sly?
Frederik is convinced that Mathilde is The Evil Santa, so when he and Josefine is invited to her house, he seize the opportunity to snoop around looking for evidence. Will he be able to expose Mathilde as The Evil Santa?
Frederik is sure that he has gotten the evidence he needs to expose The Evil Santa. A text from Josefine changes everything, and suddenly the entire class turns against him.
Everyone believes that Frederik is T.E.S., and for the first time he feels what it is like to be an outcast. Mathilde goes to the principal to tell that Frederik is behind it all. What will happen to Frederik if the principal believes her?
Bertram and Martine are convinced that the other is behind the vandalism in the school toilet, and they fight over who should be the Lucia bride - as the Lucia bride you get a microphone, and thereby the opportunity to expose the other.
The Christmas party is getting nearer, so everyone has brought their favorite dish, in order to vote on what should be served on the big night. Josefine has an idea that Bertram has knowledge on T.E.S. which may prove Frederiks innocence.
Mathilde is determined to win the treasure hunt, but the rest of her team is on a different mission. They want to figure out who is behind The Evil Santa. An unexpected call from T.E.S. brings them closer to the truth.
Josefine, Bertram and Martine desperately tries to find out why The Evil Santa has stolen the money. T.E.S. will only tell them if everyone joins on the cottage trip. There's just one problem: Frederik is furious with everyone and won't go.
Bertram, Josefine, Frederik and Martine tries to get back the money, in order to save the Christmas party. It's not that easy since T.E.S. keeps scaring them and coming with new demands.
The Evil Santa has promised to return the money, but once again, it turns out that the Santa has yet another creepy plan. The class joins forces and tries to stop T.E.S. once and for all.
The Evil Santa has disappeared from the cottage. In one last attempt the class divide to search for the Santa. Will they be able to find T.E.S.? And will they manage to save the common Christmas party?
The class prepares for the nativity play for the common Christmas party. When the party is canceled, and Frederik find out that Josefine won't stay in the class, Bertram tries to gather the class for a parting gift for Josefine.
Frederik has planned a small Christmas party for him and Josefine, but Josefine doesn't show up alone, so his surprise goes down the drain. We he finally gets her for himself, they get disturbed, and Josefine is suddenly gone.
It's finally Christmas Eve. Normally Frederik would hang out with his friends, but this year they are all busy. Suddenly he receive a text from The Evil Santa, telling him to go to the school.