While on an expedition to illustrate the magical creatures of the mountains around her home, Hilda spots a mountain troll. As the blue-haired explorer sits and sketches, she slowly starts to nod off. By the time she wakes up, the troll has totally disappeared and, even worse, Hilda is lost in a snowstorm. On her way home, Hilda befriends a lonely wooden man, and narrowly avoids getting squashed by a lost giant.