So the title says it all. I used to read a book many years ago and which I loved but I don't remember the name of the book anymore. As I remember it was a Russian translation. The story was about a girl who works in a circus and a doll who looks just like her. This doll was given to the Prince of the country who is kind of a spoiled kid. As I remember this kid's doll malfunction somehow and the girl mentioned before ends up in his castle. There's a revolution also happening in this time. The workers are revolting against the ruling class which is basically the Prince and his uncles. The One who lead the revolution is arrested and kept in a cage in a zoo which belongs to the Prince. There was something about a heart which sounds as a clock too. This is the most I can remember and it's a mess of a story. But I'll try to remember more stuff in the story.