Amazonia

The Rand research mission never came out of the beautiful Amazonian rainforest. Years later, one of its members—a former Special Forces soldier who entered the world's most hostile jungle with one arm removed and emerged with both intact—stumbled out. The man was scared, bruised, and maimed, and he was just hours from dying.

The government, unable to understand this unexplained incident, dispatches Nathan Rand to trace his father's disappearance into an unfathomably dangerous and opaque hidden realm, where riddles must be answered at any costs. But whatever threat they foresaw is dwarfed by the horror that awaits Nate and his group of scientists and experienced U.S. Army Rangers.an unseen, age-old dread with unfathomable power that has the ability to permanently change the world beyond the deadly, dark walls of the Amazon rainforest, both for the better and evil.