The Adventures of Tintin 13 The Seven Crystal Balls

After two years of absence in which it has traveled to Peru and Bolivia, the Sanders-Hardmuth ethnographic expedition returns to Europe having discovered several Inca tombs. They have brought the mummy of the Inca Rascar Capac, also called "the one who unleashes fire from heaven", who wore valuable solid gold jewels.
After a short time, all the participants of the expedition fall victim to a mysterious evil, and whenever that happens, the fragments of a small crystal balls are found.