Young Catherine arrives in Berlin by plane from her distant Kazakhstan to her cousin Thomas. Her mother had died after working in a nuclear power plant. Thomas played with the orchestra "one world", in a club. During a walk in a park, they see an exhibition of the figure skater Sophie Arnd and Katia saves the girl who fell into the lake and thus becomes a local celebrity.
Informed of this fact, a music producer whom Katia invites to her home for lunch - falls in love with Thomas's cooking and band and signs a contract with them. But at school, Katia, not yet fully accepted, falls ill - she contracts leukemia and the whole city, in the middle of summer, organizes a birthday party for her ... Katia dies - for her, Thomas sings and Sophie dances on the ice ...