Lair of the Serpent (Tombs of Terror)

A humanitarian trip to Cambodia turns deadly when Delilah, a young medical volunteer, is kidnapped. When Jonathon arrives in the jungle and discovers that his friend is missing, he recruits the locals to search for her. Every clue points to the followers of the Naga Mani--- a sacred stone with legendary powers that only work with a human sacrifice. With time running out, it's up to Jonathon to rescue Delilah.