Velma's uncle, a famous archeologist, asks the gang to visit his dig site in Mexico. It seems something is scaring his workers, and he needs to get to the bottom of it. But when Scooby-Doo and the gang arrives, the dig is empty and Velma's uncle is missing! Where did he go and what's scaring everyone? To solve the mystery, readers choose which characters to follow, discovering what seems to be Aztec ghosts and monsters along the way.