Somewhere in the early 70’s I was a young tot living in Germany (I’m hoping it was not a German book as I no longer can speak or read German) anyhoo there was this book about a boy and girl and the boy gets kidnapped by this woman I think she is an ice queen maybe evil. And she takes him to a castle and it is all ice. I remember a broken mirror and I also remember a horse and carriage ride to get the castle. The girl is also very sad and I think she looks for him. If anyone could help I would be overly greatful.