Zorro's mission to safeguard the beautiful Eulalia Bandini, takes an unexpected turn up north in Yellowstone, California, when Zorro and Eulalia encounter Thierry and Amelie Besson. In pursuing his dream of mapping this unexplored dangerous region, Thierry has run afoul of Ripklaw and Lucifer Trapp. Can Zorro still stay ahead of Capitan Monasterio and his men, while defending the Bessons from their tormentors?