The life of Zuzia, whose dad works on the railway, changes massively when Lampo, an extraordinary travelling dog, joins the family. The remarkable shepherd dog, whose train trips are an internet sensation, immediately becomes the best friend of the girl suffering from a heart condition. Unfortunately, the railway director is so envious of the dog’s fame that he will do everything to remove Lampo from his station. When he succeeds, the girl’s condition worsens. Though everyone tries to help, it is clear that only Lampo’s closeness and friendship can save Zuzia.