A quantum physicist is about to have the breakthrough of the century, but as he closes in on his goal, versions of him from parallel realities force him to untangle the mystery of his own existence; how to be a present father for his son.

Sara and Jonas fall madly in love. But then Sara discovers that Jonas is slowly radicalizing through a right-wing extremist forum online. Can love keep him from sacrificing himself for his ideologic conviction?

This time, they travel on holiday with Aunt Thea to Summer Island. There they meet Eddy who is an expert on all the challenges they can face on a magical island. It is rumored that a sea worm has been observed in the fjord, and it will not be long before the energetic sea worm expert Blegen shows up, with his strange devices and instruments. It will be an exciting summer holiday with friendship put to the test, exploration in nature and the hunt for the mysterious sea worm.

The evening before Christmas eve, Vilde is hanging out with her friends at the central station, when she learns that her mother has been in an accident. She is forced to contact her biological father, but wants to run away to Tokyo.

Lillebror moves with Twigson and his family to the western part of Norway, but he dreams of even bigger expeditions, like going to the North Pole.