The Bone Labyrinth by James Rollins

Extended Synopsis

In the remote mountains of Croatia, an archaeologist uncovers a subterranean Catholic chapel hidden for centuries, housing the bones of a Neanderthal woman and vivid primitive paintings. These ancient artworks depict a colossal battle between Neanderthal tribes and monstrous shadowy figures. When the investigative team is ambushed—and a simultaneous, bloody assault is launched upon a primate research center outside of Atlanta—Commander Gray Pierce of Sigma Force must intervene.

The search for the truth propels Pierce and his team 50,000 years into the past to trace the true source of human intelligence. Uncovering revelations tied to the lost continent of Atlantis and mankind's first steps on the moon, Sigma Force is thrust into a cataclysmic battle across the globe. They face their greatest threat yet: an ancient evil, resurrected by modern genetic science, poised to bring about the end of human dominance.