Twin sister and brother study in the same class. The girl Zina is involved in a drama club and a figure skating section, and her brother Ignat, having become convinced of his own physical weakness, begins to play in the “Tigers” yard hockey team. The first bruises and even serious contusions do not stop the stubborn boy - and soon he becomes brave and strong - one of the best players of the team that took part in the competition for the Golden Puck prize for the first time.
The plot is based on the fact that Zina, during a hockey competition, helps out, replaces her brother and helps the team win.