The Seahorse sect, led by the beautiful and ruthless Manuela Guzman, conspires to detach the territories of New Mexico from the United States and reunite them with Mexico and does not hesitate to resort to any means to achieve the goal. Tex, Kit and Carson must do their best to defeat the sect and the beautiful Manuela will meet her destiny in the desert.
In this adventure we see again, after some time, Kit Carson, who has now become a Major of the Rangers and relegated to a bureaucratic role of "chair warmer". It will be Tex who convinces him to return to action.
