A Miskatonic U. professor is found dying in the Amazon, clutching a gold statue of a human-faced spider. You are part of an expedition sent in search of the statue's source. What horrors await you - the mysterious Curapuri? The apelike Mapanguari? Amazons? A lost Incan City? Or an ancient terror spinning its webs in the tunnels below South America? A 1920s Call of Cthulhu event by CoC contributor William A. Barton, designer of Cthulhu By Gaslight.