The fate of Walter's school is jeopardized with the return of Madrigal Pierce's missing brother, Johann, and his money-hungry fiancé, Feather. The kids plan to bring D'Artagnon through the circle to show Johann his fiancé is bad news. Instead, Lady de Winter appears, adding fuel to Feather's wily ways. Could the school be lost and the trio of friends be separated? Not if the Three Musketeers can help it.