Brother and sister accidentally find themselves at a modern street ballet performance. They are so fascinated by the plot that, forgetting that they are at a performance, they climb onto the stage and find themselves in a fairyland.

This film-concert is a ballet based on the novel "The Idiot" by Fyodor Dostoevsky, set to the music of Symphony No. 6 by Pyotr Ilyich Tchaikovsky and featuring artists from the State Theatre of Modern Ballet.