This is a fantasy novel about WWII for children. Karolina is a doll who awakens in the home of a dollmaker who lives in Krakow, Poland. She has left the Land of the Dolls because it had been attacked by ferocious rats and she wanted to find a way to fight them and win the war. Instead, she helps the dollmaker become friends with a Jewish violinist and his daughter, Rena. Then, however, war finds Poland and the Nazis invade. The story is touching and sad and beautiful.