Two expidition parties head for Indochina, but for separate reasons. One led by Dr Carter on a scientific mission to find hidden treasure, the other led by Captain Friday to return a fugitive to prison.
Now on land, the sizzling heat has the expidition members looking for a cool place to rest. The prisoner, Phen Lo, had escaped while on the ship, but where has he gone? He was last seen heaving a heavy bag over the side of the ship, then plunging into the water after it.
Doc Carter shares a little about the legends of Cambodia that tells how the former cities were swallowed up by the jungle, and forced men to migrate into the cities they now inhabit. Still keeping to their original missions, the two expiditions team up with each other. What peculiar intrigue is afoot in Cambodia? Why has the French consolate urged Captain Friday to go along to protect the scientific team?
Factions in the Cambodian people are discussed, and turmoil that could threaten danger to the expidition parties. Is there anything to the suspicions, or is it all superstitions to be disregarded? What new twists and complications will arise?