This twelfth book in the Little Maid series takes place in Canada during the American Revolution. The American invasion of 1775 and 1776, with its attempt to conquer Quebec, became a part of the history of the unconquerable Citadel; and Sally and Felice's courage and determination not to help the invaders became a story known to many children of the Province. Included on the book flaps is a charming paper doll of the book's heroine, Sally, complete with costume.