Hilda and the gang take the train to Tofoten to visit Great-Aunt Astrid for a relaxing holiday — but adventure soon comes knocking at their door.

Convinced that fairies exist in Tofoten, Hilda starts investigating around town... only to uncover a troubling mystery involving her own family.

An ancient Faratok Tree transports Hilda and Wood Man to an alternate universe, where a feud rages between giants and a not-so-mighty giantslayer.

After their fellow Sparrow Scouts dub them "The Freaky Friends," Hilda, Frida and David resolve to have the most ordinary river trip imaginable.

When Hilda's father comes for a surprise visit, she joins him on a mysterious errand to the castle ruins on behalf of a shady man known as "The Polecat."

Frida holds a town hall meeting to figure out why the nisse keep stealing from each other while Hilda tries to decode her radio's cryptic messages.

Hilda journeys into the fairy mound to look for her father, unraveling surprising family secrets along the way — but the truth comes at a great risk.