Zuzė's life, whose dad Piotr works as a railwayman, is changed beyond recognition when Lampo, an extraordinary travelling dog, suddenly appears. The special wolfdog, who caused a sensation with his train journeys that have become the talk of the internet, immediately becomes the best friend of the girl with a heart defect. Unfortunately, the station manager, who is jealous of Lampo's fame, is doing everything he can to make the dog disappear from his territory. When he succeeds, the girl, separated from her beloved pet, falls ill. Although everyone tries to help her, it soon becomes clear that the only cure for the girl is the presence and companionship of a four-legged friend.