- Vol. 1: Hilda can never sit still for long without setting off on another adventure. She can't resist exploring her enchanting world-a place where trolls walk, crows speak, and mountains move. The magic and folklore of the wild, windswept North come alive in this book about an adventurous little girl and her habit of befriending anything, no matter how curious it might seem.
- Vol. 2: When creatures bombard Hilda's house with eviction notices, she has to think twice before making their acquaintance. Come to think of it, who is this giant who only appears at midnight, and why is Hilda the only person who can see him?
- Vol. 3: Hilda and her mother have finally laid roots down in their new home in Trolberg. Pining for her magical friends and wonder filled homeland, Hilda is finding it hard to fit in to this crowded new place. But today is somehow different, today Hilda sees a glimmer of the magic she left behind in the fjords.
- Vol. 4: Hilda sits in her tent, dwarfed by volumes of the Greater Fjords Wildlife Chronicles with a flashlight and her restless companion Twig, but Hilda's not in the fjords and it isn't raining. Hilda's pitched a tent in her room and it's been days since she's been out.
- Vol. 5: Hilda may be grounded, but that won't stop her from heading off on another daring adventure! But everything is thrown off course when her mother catches her and is dragged along for the ride. Furious with each other, the bickering pair find themselves lost in the land of the trolls, forced to embark on a dangerous journey to make their way home. And to make matters even more difficult, Hilda has to do so as a troll? Buckle your seatbelts for a crazy body-swapping adventure!
- Vol. 6: We rejoin our heroine for her latest adventure just as she awakes to find herself... in the body of a troll! Her mum is worried sick, and is perplexed by the strange creature that seems to have taken Hilda's place. Now, both of them are in a race to be reunited before Ahlberg and his safety patrol get the chance to use their new secret weapon to lay waste to the trolls, and Hilda along with them!