Twenty years after a wealthy British financier disappears near the site of a lost fabled city, the man's daughter leads an expedition of scientists in search of the city, which harbors a powerful but dangerous energy source.

From the depths of the Indian Ocean, a horrific plague has arisen to devastate humankind-unknown, unstoppable... and merely a harbinger of the doom that is to follow. Operatives of the shadowy covert organization Sigma Force, Dr. Lisa Cummings and Monk Kokkalis search for answers to the bizarre affliction aboard a cruise liner transformed into a makeshift hospital. But a sudden and savage attack by terrorist hijackers turns the mercy ship into a floating...

A yacht bearing a young American couple is attacked by Somali pirates, leading to bloodshed and the violent kidnapping of the pregnant woman on board. To aid in her rescue from the lawless and war-torn jungles of coastal Africa, Sigma Force enlists the aid of a unique search team.

"In the remote mountains of Croatia, an archaeologist makes a strange discovery: a subterranean Catholic chapel, hidden for centuries, holds the bones of a Neanderthal woman. In the same cavern system, elaborate primitive paintings tell the story of an immense battle between tribes of Neanderthals and monstrous shadowy figures. Who is this mysterious enemy depicted in these ancient drawings, and what do the paintings mean? Before any questions can...

"Off the coast of Brazil, a team of scientists discovers a horror like no other, an island where all life has been eradicated, consumed, and possessed by a species beyond imagination. Before they can report their discovery, a mysterious agency attacks the group, killing them all, save one: an entomologist, an expert on venomous creatures, Professor Ken Matsui from Cornell University. Strangest of all, this inexplicable threat traces back to a terrifying...

"For eons, the city of Troy--whose legendary fall was detailed in Homer's Iliad--was believed to be myth, until archaeologists in the nineteenth century uncovered its ancient walls buried beneath the sands. If Troy was real, how much of Homer's twin tales of gods and monsters, curses and miracles--the Iliad and the Odyssey--could also be true and awaiting discovery? In the frozen tundra of Greenland, a group of modern-day researchers stumble on a...

"To stop the world from burning, it's up to Sigma Force to uncover a secret buried at the heart of our planet. The Titan Project--an international research station off the coast of Australia--discovers a thriving zone of life in an otherwise dead sea. The area teems with a strange bioluminescent coral that defies science, yet holds great promise for the future. But the loss of a military submarine in the area triggers a brutal attack and sets in motion...