A documentary feature explaining the principles of Schlieren photography, which makes any phenomenon that changes the refractive index of transparent substances visible.
Simon sets out to avenge his bride's death at the hands of the bandit Martinico and by accident, he captures Martinico's bride-to-be Belen and uses her to find Martinico.
Bandit crew with mysterious masked leader is doing lots of crimes. Mauricio Rosales and his sidekick ride into town all incognito and stuff to set things right.