Trail of Cthulhu: Uku Pacha

After the discovery of Machu Picchu, other explorers and archeologists searched for other Inca ruins. A confession of a Spanish occultist who died during the Inquisition is discovered in a library's archives in the 1930s. It mentions a hidden tomb high up in the Peruvian mountains. Soon, an expedition is formed to look for the hidden tomb but they will find more than treasure buried inside.