Al Colby, international private eye, is hired by Pancha Porter to figure out why her late father's Bolivian mine has suddenly started to lose money. Driving up to the Bolivian heights is an experience in itself, with the air so thin it's hard to breathe. But the trip is made worse by the fact that someone has-accidentally?-directed the exhaust fumes to the back of the car where Colby is sitting. Recovering from the near-fatal drive, Colby and Pancha arrive at the mine where they meet Simon Braillard, the manager of the mine.The pack-llamas and the mining chemicals are being stolen on a regular basis, but he hasn't a clue who's doing the stealing. Could the local brujo, Yatiri, have something to do with it? All the native Indians fear him, quick to do his bidding. Or could this be the work of Saturnino, Braillard's surly henchman, who takes an immediate dislike to Colby? All Colby knows is that something strange is going on in the Bolivian mountains-and that something is bound to lead to murder!Black Gat #75