The Adventures of Tintin #6

A fetish which originally belonged to a tribe of South American Indians is stolen from the Museum of Ethnography in Brussels. The following day it is back in the museum, along with a note apologizing for the inconvenience caused, saying that the reason for the theft had been a bet. Tintin, who is among the reporters looking into the story, realizes that the replacement is a fake, the distinction being an ear broken on the original but intact on the replacement.

But he soon discovers that a pair of South Americans — Alonso Perez and Ramon Bada — are also on the trail of the fetish, following the same clues and employing more ruthless methods. They even make attempts on Tintin's life...