Niels doesn't like studying, and he gets sleepy at the sight of books; If you don't like to put geese and ducks, you will often play tricks on the small animals raised at home and let the poultry bite him when they see him. But there are also a group of elves living in a small village. Niels teased an elf one day and was punished to become a little man with a thumb. Before he knew what was going on, he was riding on the neck of Martin, a domestic goose, and flying into the sky with a flock of geese.

Martin decided to fly to the north with the geese, which was Lapland he had been longing for for for a long time. On the way, Niels used his intelligence to fight against the cunning fox, and outwitted the thieves in Crow Mountain regardless of difficulties and dangers. Niels and Goose uphold justice together, help people in need, and make many good friends on the way to Lapland.

It is these experiences that have turned Niels from a naughty boy into a little hero with a sense of justice, sincerity, wisdom, courage and kindness. Niels finally became a kind and sensible little boy. He changed back to his original shape and went home to live with his parents. Since then, he has become a good student who loves to learn.