The film centers around a group of gnomes who live inside an enormous tree in a fantastic realm. The tree is hollow and contains a vast city of gnomes who have houses and business in an elaborate superstructure centered around rope bridges and ladders and catwalks. The gnomes have a developed economy which is centered around maple syrup production and sale. They sell their wares to a group of gnomes who transport the syrup among other gnome villages in other trees, who create their own products. The tree comes under attack however when a family of weasels make camp there.