Swing 12

When these twelve sisters start to swing, it drives the Nazis insane. After seeing the Nazis' evil first hand during the Kristallnacht, which they would forever refer to as 'that night,' the twelve die Fürstin sisters learn never to trust their parents or the Nazis again. Over the next two years, the twelve of them are periodically sent to the boarding school of Linden Academy on the Germany/Switzerland border to be "educated" somewhere away from World War 2 and where their parents thought they wouldn't get into trouble.
However, when Wanda die Fürstin and the remaining three sisters are reunited with their elder eight sisters at Liden Academy, trouble soon follows. Thanks to a secret servant's passage hidden in their room, the elder eight sisters soon introduce Wanda and the others to the life of a swing girl in the town of Insel. It is there during the night that Wanda, and her sisters, find the freedom that they have been craving for years. But as the Nazis' influence becomes apparent, even in this small corner of Germany, Wanda decides to take a stand against them and soon inspires her sisters and the other members of the Lake Constance Swing Club to join her.
Now, Wanda and her sisters, along with the other members of the Lake Constance Swing Club have to stay one step ahead of the Nazis while they attempt to feed others, spread their messages, and raise both spirits and the Nazis' tempers. All while swinging the night away, and possibly running away to Switzerland before it's too late.