Storyline: Peter and Petra, who belong to a secret race of small people living in harmony with nature, hidden from the human world. These small folk have their own intricate society, thriving within the nooks and crannies of the human world, unknown to the larger inhabitants. Peter and Petra, curious and adventurous, long to explore the human world beyond their hidden village. One day, their wish is granted when they meet a lonely human boy named Gunnar, who is struggling to fit in at school. Gunnar is kind-hearted but shy, and he often finds solace in the nearby woods where he encounters Peter and Petra. They quickly become friends, and Gunnar's world transforms as he discovers the magic and wonders of their tiny existence.
As their friendship blossoms, Peter and Petra decide to attend Gunnar's school, posing as human children. They face a series of humorous and challenging situations as they try to blend in with the other students while keeping their true identities a secret. Along the way, they teach Gunnar valuable lessons about courage, kindness, and the importance of being true to oneself. However, their adventure is not without its obstacles. A nosy neighbor, Mrs. Svensson, grows suspicious of the new children and starts investigating their origins. Meanwhile, Peter and Petra's presence in the human world causes unintended disruptions, attracting the attention of those who wish to exploit their tiny society.