A young guy Sasha runs into a second-class car of a long-distance train with a guitar in a case. He, like many other musicians, tried to conquer Moscow, but failed. Sasha settles in a compartment to an adult shift officer Ivan returning home. For a long time on the way, the heroes manage to make friends, write songs, create their own musical group and perform on the platforms in several cities. But what will happen to their group when Ivan leaves at his station?