When little Jirka Novák and his classmate Zdeněk's family take part in a merry Santa Claus journey through the city, he has no idea how important a change in his life this evening will bring. The story of a ten-year-old boy who unexpectedly discovers his grandfather, with whom his parents had separated forever years ago, sensitively tells of the loneliness from which little Jirka finds a way out and manages to bring his grandfather back to the family.