The film's plot is based on a real story of Oksana Boturchuk, a Ukrainian track-and-field athlete and Paralympic champion of 2008, five-time silver and bronze winner at Summer Paralympics of 2008, 2012 and 2016.

Katerina Verbitskaya was raised as a noble lady with her godmother Anna Chervinskaya but for the whole world she was only the property of Peter Chervinsky. She falls in love with the nobleman Alexey Kosach who knows nothing about her origin. On the way to freedom and love, the serf maid will have to overcome a lot of trials.