The Devil's Dagger

John Peters, his wife Liz, and their friends Harry and Meg return from a successful worldwide tour of their archaeological discovery of Alexander the Great's tomb, only to find themselves drawn into a new mystery in the Mayan region of Mexico. This time, they face off against eco terrorists while investigating the case of the missing Devil’s Dagger, a stolen Mayan treasure that holds the key to uncovering a lost underwater city.