The universe is infinite, and in this boundlessness almost any of the impossible worlds are possible. In one of them, in the world of steam and flying ships, lives aviator Elizabeth von der Brahe. Our story begins with her death in an air battle with a Polish trimaran cruiser. But the death of a brave pilot unexpectedly turns into a new life for her, and for a girl from another world - a world where the USSR recently celebrated the 90th anniversary of the October Revolution.