Alva wants nothing more than to become a parent together with boyfriend Nico, but it's just not happening. Meanwhile, her sister Ellen has three children with husband Alex — and dearly wishes she hadn't.

At Tomten’s home in the North Pole, preparations are underway for Christmas. The snowman and the elves don’t have wish lists, so Santa’s workshop only runs at half speed. The problem is that people in the ordinary world have stopped believing in Santa’s existence. And if everyone stops believing in Santa, the lamp of light goes out and the world of Santa comes to an end. Santa needs to pull himself up quickly and Mother Santa and the whole family are fighting to get Santa back on track, before it’s too late.

Simon returns to the suburb where he grew up in after his graduation, to work as an teacher in his old school. He becomes aware of an event that involves some of his students in his class. This puts him in a difficult situation.

A young gang member is found dead, and the Beck group's investigation indicates that a drug network is behind it. Klas Fredén has been monitoring the network for a long time, and the Beck group - led by Alex Beijer - is most graciously allowed to work with the murder investigation in parallel. She will soon end up on a collision course with Fredén. Thus, Martin Beck, who is now head of department, is also involved in the case.

It's Midsummer Eve and Julie sets her sights on Jean, Kristin's betrothed. What can Kristin do? Both she and Jean are employed by Julie's father. Julie gets her night with Jean. But at what cost?