When Nina returns to her Aunt and Uncle's home from boarding school, expecting to celebrate the holidays, she is grief stricken to learn that her brother, Charlie, has enlisted in the war.

As she comes to terms with this reality, she learns that he has been captured and is being held in the Yankee prison. Naively, she finds comfort in his imprisonment, feeling he is at least not at war and safe. Charlie communicates that he is being treated well to Nina, but paints a truer image to their beloved Uncle.

Nina finds herself on an incredible journey to get her brother freed from the prison, but in order to do so, she becomes a spy in the White House. While working both sides of the spy ring, Nina receives word from her cousin Willie that Charlie has become "blue," meaning that he has changed sides in order to be freed from the prison, and doctor the injured soldiers. Will Nina continue her mission, now that she knows her brother is free?

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