Crooked Captain Verdoja captures Sternau and tortures him to reveal the whereabouts of the Aztec treasure. At the same time scheming Count Rodriganda has got that information from the rightful heiress and enters the pyramid of the sun god.

Mexico, 1864. The country is divided by the struggle against the French occupation and emperor Maximilian. The German doctor Karl Sternau and his friend Andreas Hasenpfeffer come to love the country and support the cause of the proud Mexicans, so the Republican cause finally turns out to be victorious.—susanneigler