Sixten is really good at singing and writes his own songs. The only problem is that he doesn't really dare to show it to anyone. But all that changes when he makes a wish one evening at a magical Santa Claus in Tivoli.

Big Christmas hits like Last Christmas and All I want for Christmas have disappeared. Sixten plays them for his teacher Eva, who encourages him to record them, and before Sixten knows it, the song has been shared everywhere.

Sixten tops all the charts, and manager Chris plans a concert. But backstage, Sixten gets nervous. Vigga has planned a secret blind date for mother Nanna. But can you become lovers if you don't know you're on a date?

Sixten is going to perform for the country's biggest record labels in search of a record deal. After the concert, Sixten gets an unexpected kiss. Vigga decides to tell Ole about her mother's money problems, but can Ole help save Christmas?

Sixten records a music video, but bad rumors and gossip spread like wildfire, and Sixten begins to have doubts. Maybe being a star isn't so great after all? Vigga makes a surprising discovery in Sixten's room.

The magical Santa Claus is broken, and it looks more than bleak to get the wish back. Maybe Aya can help, but Sixten hasn't been a very good friend. Vigga is determined to get the family together so it can be Christmas.