Tunnels of the Deep — Michael Cole

Deceit and betrayal await a history professor and the beautiful student who convinces him to leave the safety of the classroom and enter the treacherous Amazon jungle. His inner strength is tested by a man who is every bit as much a predator as the giant anacondas that abound in the swampy marshlands they must cross to locate a tunnel. The tunnel not only leads them to an ancient city, but also to a group of natives who have strange powers, which they claim they inherited from the Star Walkers. At first the professor refuses to believe in the legend, but that is before he participates in a ceremony. The rite convinces him the Star Walkers are much more than a myth.