Clara's family have been living a very happy life when the Nazis invade. Like other Jewish people, they are soon sent to Terezin, a walled town in Czechoslovakia. Despite the hardships, Clara finds wonderful new friends. An announcement that auditions are being held for a children's opera, "Brundibar," has the musical Clara eager for a part. However, when she learns that her special friend, Jacob, is involved in a dangerous escape plan, Clara has some new challenges to face.