In a young socialist pioneers' camp Artek there are children from all over the world. Yura, a boy from Belarus, promises the Czech girl Zdena to catch her a bear cub in the virgin forest close to his home village, and send it to Prague for her. After they all return home, Zdena stubbornly reminds him of his promise. Yura gets many postcards from Prague with bears on them, painted by children whom the girl has proudly told about the promised gift. Yura's friend Mikhas agrees to help the boy with the hunt but they need time.