The Secret of Iguando

"The shape had stopped behind the curtain of water. A vague, shadowy shape-part human, part lizard. A huge arm reached forward and a single claw penetrated the waterfall and pointed, glistening, at all the children." Deep in a remote jungle region of Mexico, something supernatural is stirring, disturbed by a party of zoologists. Ben and Claire Swift are there with their father. They are the only ones who realize the danger that threatens them all.