Rollins, James

Deep in the earth's polar ice cap lies the Ice Station Grendel, developed by the Soviets more than seventy years earlier, and now threatening to destroy humanity.

When the lone survivor of a scientific expedition into the Amazon stumbles out of the jungle to die mysteriously in a small village--a man who had only one arm when he went in but two when he came out--the government asks Nathan Rand, the son of the expedition's leader, to try and retrace his father's footsteps and discover what happened.

Professor Henry Conklin's attempts to prove that a previously unknown tribe of Peruvian Indians was responsible for building the cloud cities of the Andes, leads to a wonderful and terrible discovery.

A hand-picked team of specialists encounter horror beyond imagination when they embark on an expedition to the center of the world.

After a mountainside massacre yields a grim message, Painter Crowe, director of Sigma Force, must join with Commander Grayson Pierce and an unlikely ally if he is going to get to the root of a conspiracy that stretches back to a lost prehistoric colony in America.

When Connecticut middle-schooler Jake and his older sister Kady are transported back to Pangaea, the strange world of lost civilizations, they must find the truth behind the mythic Fire Opal Eye in order to survive.

Jack Ransom and his sister, Kady, are sent on a wild hunt for answers when a mysterious letter arrives on the doorstep and leads them to a strange world inhabited by a mix of long-lost civilizations, where they hope to learn the truth about their parents' disappearance.