Getting used to life in Trolberg is proving difficult for Hilda. Weeks after moving to the city with her mother, the diminutive adventurer is still missing the wonder-filled valleys and magical friends that surrounded their old home in the fjords. Peering out of her new bedroom window onto the crowded streets below, Hilda longs for her old adventures and wonders if she’ll ever fit in into this new, much less exciting place.
Things start to look up when Hilda learns that it’s the day of Trolberg’s annual Bird Parade, a spectacular carnival in which crowds people from all over the city gather to match the streets in colourful, awe-inspiring plumage. Eager to see the festival together that evening, Hilda’s mum lets Hilda go out to be shown around the neighbourhood with her new schoolmates. Unfortunately for Hilda, she soon finds out her new friends aren’t all they are cracked up to be when they take delight in throwing stones into a tree of birds.
As a poor raven falls injured from the tree, Hilda rushes to the rescue. Determined to nurse it back to health, Hilda quickly discovers that this particular bird is no ordinary feathered friend. First of all, he can talk. Second of all, he’s lost his memory — including his ability to fly! And to make matters even more complicated, the other children have run away leaving Hilda stranded with no idea of how to get back to her house.
Together, Hilda and her strange new friend embark on a quest home. Along the way they encounter all manner of bizarre creatures from outcast Trolls to ferocious Salt Lions and deadly Rat Kings and Hilda discovers that maybe the city is not so boring after all. As they go, it becomes clear that the amnesiac raven has an important mission to attend to… if only he could remember what it could be.
Will the secret truth be revealed amongst the multi-coloured floats of the Bird Parade?