A Time for Sacrifice is a Call of Cthulhu© adventure book for the classic 1920s era, written for the 7th edition Call of Cthulhu© roleplaying game. The book contains a series of five adventures set among the Mayan ruins scattered across Central and South America. Explore ancient ruins and investigate the strange phenomena surrounding their megalithic pyramids and structures. What mythos lie deep beneath the altars? Will it ever be safe to explore this strange world? Walk where they walked, read the stones they carved, study the gods they worshiped, unravel the mysteries they created. . . and make the sacrifices they made.