Commander Gray Pierce discovers his house ransacked, his pregnant lover missing; his best friend Monk's wife, Kat, is unconscious on the kitchen floor, and Kat's two daughters have vanished. Kat is in a semi-comatose state and cannot speak-- until a brilliant neurologist offers a radical approach to "unlock" her mind long enough to ask a few questions. Soon Sigma Force is on a frantic quest for answers to mysteries reaching back to the Spanish Inquisition...

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...

Recruited by Sigma Force to extract a Russian pharmaceutical magnate, who holds the biological key to a new weapons system, from Siberia, former Army Ranger Tucker Wayne and his military working dog Kane must solve an ancient mystery before the modern world suffers a fate worse than death.

Two years after vanishing into the Sudanese desert, the leader of a British archeological expedition, Professor Harold McCabe, comes stumbling out of the sands, frantic and delirious, but he dies before he can tell his story. The mystery deepens when an autopsy uncovers a bizarre corruption: someone had begun to mummify the professor's body--while he was still alive. His strange remains are returned to London for further study, when alarming news...

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.

Following the fall of Baghdad, two Iraqi boys stumble upon armed men looting the city zoo. The floodgates have been opened for the smuggling of hundreds of exotic birds, mammals, and reptiles to Western nations, but this crime hides a deeper secret. Amid a hail of bullets, a concealed underground weapons lab is ransacked and something even more horrific is set free. Seven years later, Louisiana state veterinarian Lorna Polk stumbles upon a fishing...

"A sinister fire in a Copenhagen bookstore ignites a relentless hunt across four continents. Arson and murder reveal an insidious plot to steal a Bible that once belonged to Charles Darwin, the father of evolutionary theory. And Commander Gray Pierce dives headlong into a mystery that dates back to Nazi Germany ... and to horrific experiments performed in a now-abandoned laboratory buried in a hollowed-out mountain in Poland." "A continent away, madness...

Dead men tell many tales, though Commander Gray Pierce, Sigma, and Vatican historians could do without the twisted history lesson when a pair of disturbing artifacts sent by a missing colleague point to a tomb said to hold riches and the secret behind an ancient empire.

To stop the coming apocalypse, a fellowship was formed. A soldier, a thief, a lost prince, and a young girl bonded by fate and looming disaster. Each step along this path has changed the party, forging deep alliances and greater enmities. All the while, hostile forces have hunted them, fearing what they might unleash. Armies wage war around them. For each step has come with a cost-in blood, in loss, in heartbreak. Now, they must split, traveling into...

"A vicious attack at a ranch in California thrusts archaeologist Erin Granger back into the fold of the Sanguines, an immortal order founded on the blood of Christ and tasked with protecting the world from the beasts haunting its shadows and waiting to break free into the sunlight. Following the prophetic words found in the Blood Gospel--a tome written by Christ and lost for centuries--Erin must again join forces with Army Sergeant Jordan Stone and...