Number the stars

In this book, I know that Annemarie and Ellen were friends. Kirsti was Annemarie's younger sister. I think she was very cute and she always asks some silly questions that makes her sister and mother had nothing to say. And she was a brave girl too. I know that the Germans were bad. They made orders to close many stores run by Jews. And they planed to arrest all the Danish Jews. Ellen's family will be taken away if they don't hide themselves too. So, Annemarie's father planed to keep Ellen and take her parents to a safe place.